A theorem on maps with non-negative Jacobians.
Nijenhuis, Albert ; Richardson, R. W.
Michigan Math. J., Tome 9 (1962) no. 1, p. 173-176 / Harvested from Project Euclid
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Publié le : 1962-05-14
Classification:  57.20 
@article{1028998676,
     author = {Nijenhuis, Albert and Richardson, R. W.},
     title = {A theorem on maps with non-negative Jacobians.},
     journal = {Michigan Math. J.},
     volume = {9},
     number = {1},
     year = {1962},
     pages = { 173-176},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1028998676}
}

Nijenhuis, Albert; Richardson, R. W. A theorem on maps with non-negative Jacobians.. Michigan Math. J., Tome 9 (1962) no. 1, pp.  173-176. http://gdmltest.u-ga.fr/item/1028998676/