@article{1250131893,
author = {Reid, William T.},
title = {Generalized polar coordinate transformation for differential systems},
journal = {Rocky Mountain J. Math.},
volume = {1},
number = {4},
year = {1971},
pages = { 383-406},
language = {en},
url = {http://dml.mathdoc.fr/item/1250131893}
}
Reid, William T. Generalized polar coordinate transformation for differential systems. Rocky Mountain J. Math., Tome 1 (1971) no. 4, pp. 383-406. http://gdmltest.u-ga.fr/item/1250131893/