TY  - JOUR
AU  - V. V. Matyushkov
TI  - The vertex function of directed graphs
JO  - Doklady Akademii Nauk
PY  - 1962
SP  - 37
EP  - 40
VL  - 146
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1962_146_1_a9/
LA  - ru
ID  - DAN_1962_146_1_a9
ER  -