TY  - JOUR
AU  - Alex, Leo J.
AU  - Morrow, Dean C.
TI  - Index Four Simple Groups
JO  - Canadian journal of mathematics
PY  - 1978
SP  - 1
EP  - 21
VL  - 30
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1978-001-x/
DO  - 10.4153/CJM-1978-001-x
ID  - 10_4153_CJM_1978_001_x
ER  -