[2] R. A. Brualdi: 
Common transversals and strong exchange systems. J. Combin. Theory Ser. B 3 (1970), 307-329. 
MR 0256887 | 
Zbl 0194.00802 
[3] J.  Edmonds: 
Submodular functions, matroids and certain polyhedra. Combinatorial structures and their applications (R. Guy, H. Hanani, N. Sauer, J. Schonheim, eds.). Gordon and Breach, New York, 1970, pp. 69-87. 
MR 0270945 | 
Zbl 0268.05019 
[4] J. Edmonds D. R. Fulkerson: 
Transversals and matroid partitions. J. Res. Nat. Bur. Standards Sect. B 69 (1965), 147-153. 
MR 0188090 
[5] M. Grötschel L. Lovász A. Schrijver: 
Geometric Algorithms and Combinatorial Optimization. Springer, Berlin, 1988. 
MR 0936633 
[7] P. Horák: 
Transversals and matroids. Topics in Combinatorics and Graph Theory (R. Bodendiek, R. Henn, eds.). Physica-Verlag, Heidelberg, 1990, pp. 381-389. 
MR 1100058 
[10] M. Kochol: Some generalizations of transversal theory. CSc. thesis, Bratislava, 1990. (In Slovak.)
[12] C. J. H. McDiarmid: 
Rado's theorem for polymatroids. Proc. Cambridge Phil. Soc. 18 (1975), 263-281. 
MR 0379247 | 
Zbl 0321.05028 
[18] A. Recski: 
Matroid Theory and its Applications in Electric Network Theory and in Statics. Springer, Berlin, 1989. 
MR 1027839 | 
Zbl 0729.05012 
[19] A. Schrijver: 
Total dual integrality from directed graphs, crossing families, and sub- and supermodular functions. Progress in Combinatorial Optimization (W. R. Pulleyblank, ed.). Academic Press, Toronto, 1984, pp. 315-362. 
MR 0771885 | 
Zbl 0542.90068