@article{1103840983,
author = {Boyling, J. B.},
title = {Carath\'eodory's principle and the existence of global integrating factors},
journal = {Comm. Math. Phys.},
volume = {7},
number = {1},
year = {1968},
pages = { 52-68},
language = {en},
url = {http://dml.mathdoc.fr/item/1103840983}
}
Boyling, J. B. Carathéodory's principle and the existence of global integrating factors. Comm. Math. Phys., Tome 7 (1968) no. 1, pp. 52-68. http://gdmltest.u-ga.fr/item/1103840983/