@article{1029001061,
author = {Montgomery, Deane and Yang, C. T.},
title = {Homotopy equivalence and differentiable pseudo-free circle actions on homotopy spheres.},
journal = {Michigan Math. J.},
volume = {20},
number = {1},
year = {1973},
pages = { 145-159},
language = {en},
url = {http://dml.mathdoc.fr/item/1029001061}
}
Montgomery, Deane; Yang, C. T. Homotopy equivalence and differentiable pseudo-free circle actions on homotopy spheres.. Michigan Math. J., Tome 20 (1973) no. 1, pp. 145-159. http://gdmltest.u-ga.fr/item/1029001061/