TY  - JOUR
AU  - Wei, Changguo
AU  - Zhao, Xiangmei
AU  - Liu, Shudong
TI  - Pseudometrics on Ext-semigroups
JO  - Czechoslovak Mathematical Journal
PY  - 2020
SP  - 435
EP  - 451
VL  - 70
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.2019.0352-18/
DO  - 10.21136/CMJ.2019.0352-18
LA  - en
ID  - 10_21136_CMJ_2019_0352_18
ER  -