@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/