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@article{MS2_1973__33_166331, author = {Peter Orlik}, title = {Homotopy {4-Spheres} {Have} {Little} {Symmetry.}}, journal = {Mathematica Scandinavica}, pages = {275--278}, publisher = {mathdoc}, volume = {33}, year = {1973}, zbl = {0281.57029}, url = {http://geodesic.mathdoc.fr/item/MS2_1973__33_166331/} }
Peter Orlik. Homotopy 4-Spheres Have Little Symmetry.. Mathematica Scandinavica, Tome 33 (1973), pp. 275-278. http://geodesic.mathdoc.fr/item/MS2_1973__33_166331/