TY  - JOUR
AU  - Jambor, Pavel
TI  - An orthogonal theory of a set-valued bifunctor
JO  - Czechoslovak Mathematical Journal
PY  - 1973
SP  - 447
EP  - 454
VL  - 23
IS  - 3
PB  - mathdoc
UR  - https://geodesic-test.mathdoc.fr/articles/10.21136/CMJ.1973.101186/
DO  - 10.21136/CMJ.1973.101186
LA  - en
ID  - 10_21136_CMJ_1973_101186
ER  -