@article{1200688758,
author = {Nagumo, Mitio and Anasako, Yukio},
title = {On Perron's method for the semi-linear hyperbolic system of partial differential equations in two independent variables},
journal = {Osaka Math. J.},
volume = {7},
number = {1},
year = {1955},
pages = { 179-184},
language = {en},
url = {http://dml.mathdoc.fr/item/1200688758}
}
Nagumo, Mitio; Anasako, Yukio. On Perron's method for the semi-linear hyperbolic system of partial differential equations in two independent variables. Osaka Math. J., Tome 7 (1955) no. 1, pp. 179-184. http://gdmltest.u-ga.fr/item/1200688758/