TY  - JOUR
AU  - Welsh, D. J. A.
TI  - Transversal Theory and Matroids
JO  - Canadian journal of mathematics
PY  - 1969
SP  - 1323
EP  - 1330
VL  - 21
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1969-145-0/
DO  - 10.4153/CJM-1969-145-0
ID  - 10_4153_CJM_1969_145_0
ER  -