@article{1195524250,
author = {Nagumo, Mitio},
title = {On singular perturbation of linear partial differential equations with constant coefficients, I},
journal = {Proc. Japan Acad.},
volume = {35},
number = {10},
year = {1959},
pages = { 449-454},
language = {en},
url = {http://dml.mathdoc.fr/item/1195524250}
}
Nagumo, Mitio. On singular perturbation of linear partial differential equations with constant coefficients, I. Proc. Japan Acad., Tome 35 (1959) no. 10, pp. 449-454. http://gdmltest.u-ga.fr/item/1195524250/