@article{1183497369,
author = {Thomas, J. M.},
title = {The condition for a pfaffian system in involution},
journal = {Bull. Amer. Math. Soc.},
volume = {40},
number = {12},
year = {1934},
pages = { 316-320},
language = {en},
url = {http://dml.mathdoc.fr/item/1183497369}
}
Thomas, J. M. The condition for a pfaffian system in involution. Bull. Amer. Math. Soc., Tome 40 (1934) no. 12, pp. 316-320. http://gdmltest.u-ga.fr/item/1183497369/