@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/