**Some recent papers:**- Packing feedback arc sets in tournaments exactly and Mathematica Code (With Xujin Chen, Wenan Zang, and Qiulan Zhao)
- Strengthened chain theorems for different versions of 4-connectivity (with Chengfu Qin)
- Unavoidable induced subgraphs of large 2-connected graphs (with Sarah Allred and Bogdan Oporowski)
- On Gupta's co-density conjecture (with Yan Cao, Guantao Chen, Guangming Jing, Wenan Zang).
- Graphs without large K2n-minors
- Online MinCut: competitive and regret analysis (with Avah Banerjee)

**Journal papers**- Ranking tournaments with no errors II: Minmax relation and appendix-1 and appendix-2 (with Xujin Chen, Wenan Zang, and Qiulan Zhao) Journal of Combinatorial Theory Series B 142 (2020) 244-275.
- Ranking tournaments with no errors I: Structural description (with Xujin Chen, Wenan Zang, and Qiulan Zhao) Journal of Combinatorial Theory Series B 141 (2020) 264-294.
- A chain theorem for 4-connected graphs (with Chengfu Qin) Journal of combinatorial Theory Series B 139 (2019) 341-349.
- Minimal k-connected non-Hamiltonian graphs (with Emily Marshall) Graphs and Combinatorics 34 (2018) 289-312.
- Excluding a large theta graph (with Emily Marshall) Journal of Combinatorial Theory Series B 132 (2018) 47-79.
- On box-perfect graphs (with Wenan Zang and Qiulan Zhao) Journal of Combinatorial Theorey Series B Volume 128 (2018) 17-46.
- On almost-planar graphs (with Joshua Fallon and Emily Marshall), The Electronic Journal of Combinatorics 25(1) (2018) #P1.55
- When is the matching polytope box-totally dual integral? (with Lei Tan and Wenan Zang) , Mathematics of Operations Research, Volume 43 Issue 1 (2018) page 64-99
- Unavoidable connected matroids retaining a specified minor (with Carolyn Chun, Dillon Mayhew, and James Oxley) SIAM Journal on Discrete Mathematics 30(3) (2016) 1590-1606.
- Hall-type results for 3-connected projective graphs and Supplement (with Perry Iverson) Journal of Graph Theory 82(3) (2016) 253-264.
- Large Wk- or K3t-minors in 3-connected graphs (with Stan Dziobiak and Haidong Wu) Journal of Graph Theory 82(2) (2016) 207-217.
- Graphs with no P7-minor (with Chanun Lewchalermovongs and John Maharry) The Electronic Journal of Combinatorics 23(2) (2016) #P2.12
- Excluded-minor characterization of apex-outerplanar graphs (with Stan Dziobiak) Graphs and Combinatorics 32 (2) (2016) 583-627.
- Characterizing binary matroids with no P9-minor (with Haidong Wu) Advances in Applied Mathematics 70 (2015) 70-91
- Internally 4-connected projective graphs and Supplement (with Perry Iverson) Journal of Combinatorial Theory Series B 108 (2014) 123-138
- A characterization of graphs with no octahedron minor and Supplement Journal of Graph Theorey 74(2) (2013) 143-162.
- On 3-connected graphs of path-width at most three (with Stan Dziobiak) SIAM Journal on Discrete Mathematics 27(3) 1514-1526 (2013)
- Excluding a small minor and Supplement (with Cheng Liu) Discrete Applied Mathematics 161(3) (2013) 355-368
- The maximum-weight stable matching problem: duality and efficiency (with Xujin Chen, Xiaodong Hu, and Wenan Zang) SIAM Journal on Discrete Mathematics 26(3) (2012) 1346-1360.
- A chain theorem for 3+-connected graphs (with Cheng Liu) SIAM Journal on Discrete Math 26(1) (2012) 102-113
- Bandwidth of trees of diameter at most 4 (completed by the VIGRE Combinatorics Crew under my supervision) Discrete Math 312 (2012) 1947-1951
- Bonds with parity constraints (with Xujin Chen, Xingxing Yu, Wenan Zang) J. Comb. Theory, Ser. B 102 (2012) 588-609
- Large non-planar graphs and an application to crossing-critical graphs (wirh Oporowski, Thomas, Vertigan) J. Comb. Theory, Ser. B 101(2): 111-121 (2011)
- Vertex-Bipartition Method for Colouring Minor-Closed Classes of Graphs (with Dziobiak) Combinatorics, Probability & Computing 19(4): 579-591 (2010)
- Transforms of pseudo-Boolean random variables (with Lax, Chen, Chen, Marx) Discrete Applied Mathematics 158(1): 13-24 (2010)
- Unavoidable topological minors of infinite graphs (with Chun) Discrete Mathematics 310(24): 3512-3522 (2010)
- Splitter Theorems for 4-Regular Graphs (with Kanno) Graphs and Combinatorics 26(3): 329-344 (2010)
- The box-TDI system associated with 2-edge connected spanning subgraphs (with Chen and Zang) Discrete Applied Mathematics 157(1): 118-125 (2009)
- The edge version of Hadwiger's conjecture. Discrete Mathematics 309(5): 1118-1122 (2009)
- On canonical antichains. Discrete Mathematics 309(5): 1123-1134 (2009)
- Unavoidable parallel minors of 4-connected graphs (with Chun, Oporowski, Vertigan) Journal of Graph Theory 60(4): 313-326 (2009)
- Generating 5-regular planar graphs (with Kanno and Su) Journal of Graph Theory 61(3): 219-240 (2009)
- Packing circuits in matroids (with Zang) Math. Program. 119(1): 137-168 (2009)
- Formulas for approximating pseudo-Boolean random variables (with Lax, Chen, Chen) Discrete Applied Mathematics 156(10): 1581-1597 (2008)
- A Characterization of Box-Mengerian Matroid Ports (with Chen and Zang) Math. Oper. Res. 33(2): 497-512 (2008)
- The complexity of recognizing linear systems with certain integrality properties (with Feng and Zang) Math. Program. 114(2): 321-334 (2008)
- Graph-theoretic method for merging security system specifications (with Chen, Lax, Chen). Information Sciences 177(10): 2152-2166 (2007)
- Asymptotic Behavior of Linear Approximations of Pseudo-Boolean Functions (with Lax, Chen, Chen) Journal of Advanced Computational Intelligence and Intelligent Informatics 11(4): 403-409 (2007)
- Splitter Theorems for Cubic Graphs (with Kanno) Combinatorics Probability & Computing 15(3): 355-375 (2006)
- A Min-Max Relation on Packing Feedback Vertex Sets (with Chen, Hu, Zang) Math. Oper. Res. 31(4): 777-788 (2006)
- On Minimal Rank over Finite Fields (with Andrei Kotlov) Electronic Journal of Linear Algebra 15 (2006) 210-214.
- On The Complexity Of Rooted Trees And Hierarchies With Possible Applications To Organization Design And System Architectures (with Peter Chen), WSEAS Transactions on Systems 5(3) (2006) 625-630.
- New bounds for randomized busing (with Seiden, Chen, Lax, Chen). Theoretical Computer Science 332(1-3): 63-81 (2005)
- Unavoidable doubly connected large graphs (with Peter Chen) Discrete Mathematics 280(1-3): 1-12 (2004)
- Excluding any graph as a minor allows a low tree-width 2-coloring (with Matt DeVos, Bogdan Oporowski, Daniel Sanders, Bruce Reed, Paul Seymour, Dirk Vertigan) J. Comb. Theory, Ser. B 91(1): 25-41 (2004)
- The best expert versus the smartest algorithm (with Peter Chen) Theoretical Computer Science 324(2-3): 361-380 (2004)
- Generating r-regular graphs (with Peter Chen) Discrete Applied Mathematics 129(2-3): 329-343 (2003)
- Partitioning into graphs with only small components (with Noga Alon, Bogdan Oporowski, Dirk Vertigan) J. Comb. Theory, Ser. B 87(2): 231-243 (2003)
- Packing cycles in graphs, II (with Zhenzhen Xu, Wenan Zang) J. Comb. Theory, Ser. B 87(2): 244-253 (2003)
- On interval clutters. Discrete Mathematics 254(1-3): 89-102 (2002)
- Packing Cycles in Graphs (with Wenan Zang) J. Comb. Theory, Ser. B 86(2): 381-407 (2002)
- Spanning trees with many leaves (with Thor Johnson and Paul Seymour) Journal of Graph Theory 37(4) (2001) 189-197.
- Surfaces, Tree-Width, Clique-Minors, and Partitions (with Bogdan Oporowski, Daniel Sanders, Dirk Vertigan) J. Comb. Theory, Ser. B 79(2): 221-246 (2000)
- Partitioning graphs of bounded tree-width, (Joint with D. Sanders, B. Oporowski, and D. Vertigan),
*Combinatorica*.**18**(1) (1998), 1 - 12. - Chordal graphs, interval graphs, and wqo,
*Journal of Graph Theory*.**28**(2) (1998), 105 - 114. - Unavoidable minors of large 3-connected matroids, (Joint with B. Oporowski, J. Oxley, and D. Vertigan),
*Journal of Combinatorial Theory, Series*B,**71**(2) (1997), 244--293. - Matroids arisen from matrogenic graphs, (Joint with P. Hammer),
*Discrete Mathematics***165/166**(1997) 211-217. - Bounding the number of circuits of a graph,
*Combinatorica*,**16**(3) (1996), Page 331--341. - Unavoidable minors of large 3-connected binary matroids, (Joint with B. Oporowski, J. Oxley and D. Vertigan),
*Journal of Combinatorial Theory, Series*B,**66**(2) (1996), 334 - 360. - On tree partitions of graphs, (Joint with B. Oporowski),
*Discrete Mathematics,***149**(1996), 45 - 58. - Excluding a long double path minor,
*Journal of Combinatorial Theory, Series*B,**66**(1) (1996), 11 - 23. - Some results on tree decomposition of graphs, (Joint with B. Oporowski),
*Journal of Graph Theory*,**20**(4) (1995), 481 - 499. - Bounding the number of bases of a matroid,
*Combinatorica*,**15**(2) (1995), 159 -169. - Graphs with not too many spanning trees,
*Networks*,**25**(1995), 193 -197. - On infinite antichains of matroids, (Joint with B. Oporowski and J. Oxley),
*Journal of Combinatorial Theory, Series*B,**63**(1) (1995), 21 - 40. - Recognizing the $P_4$-structure of a tree,
*Graphs and Combinatorics*,**10**(1994), 323 - 328. - Bounding the vertex cover number of a hypergraph, (Joint with P. Seymour and P. Winkler),
*Combinatorica*,**14**(1) (1994), 23 - 34. - Monotone clutters,
*Discrete Mathematics*,**119**(1993), 67 - 77. - Stable sets versus independent sets,
*Discrete Mathematics*,**117**(1993), 73 - 88. - Clutters with $\tau_2=2\tau$,
*Discrete Mathematics*,**115**(1993), 141 -152. - Disjoint cycles in directed graphs on the torus and the Klein bottle, (Joint with A. Schrijver and P. Seymour),
*Journal of Combinatorial Theory, Series*B,**58**(1) (1993), 40 - 45. - Disjoint circuits on a Klein bottle and a theorem on posets,
*Discrete Math.*,**112**(1993), 81 - 91. - Subgraphs and well-quasi-ordering,
*Journal of Graph Theory*,**16**(5) (1992), 489 - 502. - Disjoint paths in a planar graph - a general theorem, (Joint with A. Schrijver and P. Seymour),
*SIAM Journal of Discrete Mathematics*,**5**(1) (1992), 112 -116. - Covering the edges with consecutive sets,
*Journal of Graph Theory*,**15**(5) (1991), 559 - 562. - On the maximum 2--1 matching,
*ACTA mathematicae applicatae Sinica*,**3**(4) (1987), 305 - 312.

**Proceeding papers**- Learning Terrorist Profiles by Optimization with Two Objectives (with Lax, Chen, Chen, Marx) International Conference on Information and Knowledge Engineering (IKE) 2009: 364-369
- Fuzzy Clustering and Iterative Relational Classification for Terrorist Profiling (with Chen, Xu, Chen, Lax, Marx). IEEE International Conference on Granular Computing (GrC) 2008: 142-147
- Empirical Comparison of Greedy Strategies for Learning Markov Networks of Treewidth k (with Nunez, Chen, Chen, Lax, Marx) International Conference on Machine Learning and Applications (ICMLA) 2008: 106-111
- Local Soft Belief Updating for Relational Classification (with Lax, Chen, Chen, Marx) International Symposium on Methodologies for Intelligent Systems (ISMIS) 2008: 525-534
- A Low Bound for Broadcast in Optical Networks of Bounded Treewidth Using Fewest Converters (with Yi and Oporowski) IEEE International Performance, Computing, and Communications Conference (IPCCC) 2007: 142-149
- Comparison of Greedy Strategies for Learning Markov Networks of Treewidth k (with Lax, Chen, Chen, Marx) International Conference on Machine Learning; Models, Technologies and Applications (MLMTA) 2007: 294
- Efficient Learning of Pseudo-Boolean Functions from Limited Training Data, (with Jianhua Chen, Peter Chen, and Bob Lex), Lecture Notes in Computer Science, Volume 3488, Page 323-331. Title: Foundations of Intelligent Systems: 15th International Symposium, ISMIS 2005, Saratoga Springs, NY, USA, May 25-28, 2005. Proceedings Editors: Mohand-Said Hacid, Neil V. Murray, Zbigniew W. Ras, Shusaku Tsumoto.
- Approximating Pseudo-Boolean Functions on Non-uniform domains, (with R. Lax, P. Chen and J. Chen), International Joint Conference on Artificial Intelligence (IJCAI05), Page 1754-1755.
- A Min-Max Relation on Packing Feedback Vertex Sets, (with Xujin Chen, Xiaodong Hu, and Wenan Zang), Lecture Notes in Computer Science, Volume 3827, Page 126 - 135. Title: Algorithms and Computation: 16th International Symposium, ISAAC 2005, Sanya, Hainan, China, December 19-21, 2005. Proceedings Editors: Xiaotie Deng and Dingzhu Du.
- A new method for learning pseudo-Boolean functions with applications in terrorists profiling, (with Jianhua Chen, Peter Chen, and Bob Lex), 2004 IEEE Conference on Cybernetics and Intelligent Systems, Volume 1, (2005) 234- 239.
- The immersion relation on webs (Extended abstract),
*Contemporary Mathematics*,**147**(1993),*Graph Structure Theory*, American Mathematical Society, Volume Editors: Neil Robertson and Paul Seymour, Page 517 - 524.

**Some other papers**- Pseudo-Boolean functions, Lovasz extensions, and Beta distributions (with Robert Lax)
- On poset merging (with Chen and Seiden)
- A greedy heuristic for a generalized set covering problem (with Peter Chen) Rutcor Research Report 16-2008
- Packing of bipartite graphs (.ps format)
- Ordering the vertices of a graph linearly, Rutcor Research Report 53-1989.
- Threshold digraphs, (Joint with Chi Wang), Rutcor Research Report 50-1989.

Privacy Statement