TY  - JOUR
AU  - Li, Qiao
AU  - Brualdi, Richard A.
TI  - On minimal regular digraphs with girth 4
JO  - Czechoslovak Mathematical Journal
PY  - 1983
SP  - 439
EP  - 447
VL  - 33
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1983.101894/
DO  - 10.21136/CMJ.1983.101894
LA  - en
ID  - 10_21136_CMJ_1983_101894
ER  -