@article{1183498690,
author = {Fuller, Gordon},
title = {On the invariant character of a system of partial differential equations},
journal = {Bull. Amer. Math. Soc.},
volume = {42},
number = {12},
year = {1936},
pages = { 107-114},
language = {en},
url = {http://dml.mathdoc.fr/item/1183498690}
}
Fuller, Gordon. On the invariant character of a system of partial differential equations. Bull. Amer. Math. Soc., Tome 42 (1936) no. 12, pp. 107-114. http://gdmltest.u-ga.fr/item/1183498690/