TY  - JOUR
AU  - Lyu, Zhenhua
TI  - Extremal Digraphs Avoiding Distinct Walks of Length 4 with the Same Endpoints
JO  - Discussiones Mathematicae. Graph Theory
PY  - 2022
SP  - 985
EP  - 1004
VL  - 42
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DMGT_2022_42_3_a18/
LA  - en
ID  - DMGT_2022_42_3_a18
ER  -