1. Perfect matchings of a graph
2. and ?The optimal path-matching problem,? Proceedings of thirty-seventh Symposium on the Foundations of Computing, IEEE Computer Society Press, 1996, pp. 78-85.
3. The optimal path-matching problem
4. ?Submodular functions, matroids and certain polyhedra,? Combinatorial Structures and their Applications, et al. (Editors), Gordon and Breach, New York, 1970, pp. 69-87.
5. Transversals and matroid partition