TY  - JOUR
AU  - Vadim E. Levit
AU  - Eugen Mandrescu
TI  - A set and collection lemma
JO  - The electronic journal of combinatorics
PY  - 2014
VL  - 21
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.37236/2514/
DO  - 10.37236/2514
ID  - 10_37236_2514
ER  -