@article{1102945698,
author = {Church, P. T. and Timourian, J. G.},
title = {Differentiable open maps of $(p+1)$-manifold to $p$-manifold.},
journal = {Pacific J. Math.},
volume = {49},
number = {2},
year = {1973},
pages = { 35-45},
language = {en},
url = {http://dml.mathdoc.fr/item/1102945698}
}
Church, P. T.; Timourian, J. G. Differentiable open maps of $(p+1)$-manifold to $p$-manifold.. Pacific J. Math., Tome 49 (1973) no. 2, pp. 35-45. http://gdmltest.u-ga.fr/item/1102945698/