TY  - JOUR
AU  - Seip, Ulrich
TI  - Categorical Fibrations
JO  - Canadian mathematical bulletin
PY  - 1967
SP  - 5
EP  - 17
VL  - 10
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1967-002-8/
DO  - 10.4153/CMB-1967-002-8
ID  - 10_4153_CMB_1967_002_8
ER  -