@article{1028999655,
author = {Montgomery, D. and Yang, C. T.},
title = {Differentiable transformation groups on homotopy spheres.},
journal = {Michigan Math. J.},
volume = {14},
number = {1},
year = {1967},
pages = { 33-46},
language = {en},
url = {http://dml.mathdoc.fr/item/1028999655}
}
Montgomery, D.; Yang, C. T. Differentiable transformation groups on homotopy spheres.. Michigan Math. J., Tome 14 (1967) no. 1, pp. 33-46. http://gdmltest.u-ga.fr/item/1028999655/