TY  - JOUR
AU  - Zelinka, Bohdan
TI  - Isotopy of digraphs
JO  - Czechoslovak Mathematical Journal
PY  - 1972
SP  - 353
EP  - 360
VL  - 22
IS  - 3
PB  - mathdoc
UR  - https://geodesic-test.mathdoc.fr/articles/10.21136/CMJ.1972.101106/
DO  - 10.21136/CMJ.1972.101106
LA  - en
ID  - 10_21136_CMJ_1972_101106
ER  -