@article{GDZPPN002352427, title = {Homotopy 4-Spheres Have Little Symmetry.}, journal = {Mathematica Scandinavica}, volume = {32}, year = {1973}, pages = {275-278}, zbl = {0281.57029}, url = {http://dml.mathdoc.fr/item/GDZPPN002352427} }
Orlik, Peter. Homotopy 4-Spheres Have Little Symmetry.. Mathematica Scandinavica, Tome 32 (1973) pp. 275-278. http://gdmltest.u-ga.fr/item/GDZPPN002352427/