@article{1028998279,
author = {Sternberg, Shlomo and Swan, Richard G.},
title = {On maps with nonnegative Jacobian.},
journal = {Michigan Math. J.},
volume = {6},
number = {1},
year = {1959},
pages = { 339-342},
language = {en},
url = {http://dml.mathdoc.fr/item/1028998279}
}
Sternberg, Shlomo; Swan, Richard G. On maps with nonnegative Jacobian.. Michigan Math. J., Tome 6 (1959) no. 1, pp. 339-342. http://gdmltest.u-ga.fr/item/1028998279/