TY  - JOUR
AU  - Zelinka, Bohdan
TI  - Derivatives of hypergraphs
JO  - Czechoslovak Mathematical Journal
PY  - 1978
SP  - 394
EP  - 399
VL  - 28
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1978.101544/
DO  - 10.21136/CMJ.1978.101544
LA  - en
ID  - 10_21136_CMJ_1978_101544
ER  -