@article{1178244358,
author = {Sasaki, Shigeo},
title = {On differentiable manifolds with $(\phi ,\,\psi)$-structures},
journal = {Tohoku Math. J. (2)},
volume = {13},
number = {3},
year = {1961},
pages = { 132-153},
language = {en},
url = {http://dml.mathdoc.fr/item/1178244358}
}
Sasaki, Shigeo. On differentiable manifolds with $(\phi ,\,\psi)$-structures. Tohoku Math. J. (2), Tome 13 (1961) no. 3, pp. 132-153. http://gdmltest.u-ga.fr/item/1178244358/