TY  - JOUR
AU  - Porter, Jack R.
AU  - Woods, R. Grant
TI  - The Poset of Perfect Irreducible Images of a Space
JO  - Canadian journal of mathematics
PY  - 1989
SP  - 213
EP  - 233
VL  - 41
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1989-011-7/
DO  - 10.4153/CJM-1989-011-7
ID  - 10_4153_CJM_1989_011_7
ER  -