TY  - JOUR
AU  - Ohta, Haruto
TI  - Topological Extension Properties and Projective Covers
JO  - Canadian journal of mathematics
PY  - 1982
SP  - 1255
EP  - 1275
VL  - 34
IS  - 6
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1982-088-4/
DO  - 10.4153/CJM-1982-088-4
ID  - 10_4153_CJM_1982_088_4
ER  -