TY  - JOUR
AU  - Penna, Michael A.
TI  - On a Theorem of Sullivan
JO  - Canadian mathematical bulletin
PY  - 1978
SP  - 201
EP  - 206
VL  - 21
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1978-034-3/
DO  - 10.4153/CMB-1978-034-3
ID  - 10_4153_CMB_1978_034_3
ER  -