@article{1183420470,
author = {Noble, C. A.},
title = {Necessary conditions that three or more partial differential equations of the second order shall have common solutions},
journal = {Bull. Amer. Math. Soc.},
volume = {16},
number = {3},
year = {1909},
pages = { 10-14},
language = {en},
url = {http://dml.mathdoc.fr/item/1183420470}
}
Noble, C. A. Necessary conditions that three or more partial differential equations of the second order shall have common solutions. Bull. Amer. Math. Soc., Tome 16 (1909) no. 3, pp. 10-14. http://gdmltest.u-ga.fr/item/1183420470/