@article{1183499758,
author = {Lewis, D. C.},
title = {On line integrals and differential equations, especially those of dynamics},
journal = {Bull. Amer. Math. Soc.},
volume = {43},
number = {12},
year = {1937},
pages = { 277-282},
language = {en},
url = {http://dml.mathdoc.fr/item/1183499758}
}
Lewis, D. C. On line integrals and differential equations, especially those of dynamics. Bull. Amer. Math. Soc., Tome 43 (1937) no. 12, pp. 277-282. http://gdmltest.u-ga.fr/item/1183499758/