TY  - JOUR
AU  - He, Jing
TI  - Extensions of covariantly finite subcategories revisited
JO  - Czechoslovak Mathematical Journal
PY  - 2019
SP  - 403
EP  - 415
VL  - 69
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.2018.0338-17/
DO  - 10.21136/CMJ.2018.0338-17
LA  - en
ID  - 10_21136_CMJ_2018_0338_17
ER  -