TY  - JOUR
AU  - Peter Orlik
TI  - Homotopy 4-Spheres Have Little Symmetry.
JO  - Mathematica Scandinavica
PY  - 1973
SP  - 275
EP  - 278
VL  - 33
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MS2_1973__33_166331/
ID  - MS2_1973__33_166331
ER  -