TY  - JOUR
AU  - Ya. A. Kopylov
TI  - On some diagram assertions in preabelian and $P$-semi-abelian categories
JO  - Izvestiya of Saratov University. Mathematics. Mechanics. Informatics
PY  - 2020
SP  - 434
EP  - 443
VL  - 20
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ISU_2020_20_4_a2/
LA  - en
ID  - ISU_2020_20_4_a2
ER  -