@article{1250523122,
author = {Yoshida, Tomoyoshi},
title = {On $SO(3)$-actions on homotopy 7-spheres},
journal = {J. Math. Kyoto Univ.},
volume = {15},
number = {2},
year = {1975},
pages = { 149-168},
language = {en},
url = {http://dml.mathdoc.fr/item/1250523122}
}
Yoshida, Tomoyoshi. On $SO(3)$-actions on homotopy 7-spheres. J. Math. Kyoto Univ., Tome 15 (1975) no. 2, pp. 149-168. http://gdmltest.u-ga.fr/item/1250523122/