@article{1183513320,
author = {Ingersoll, Benham M.},
title = {An initial value problem for hyperbolic
differential equations},
journal = {Bull. Amer. Math. Soc.},
volume = {54},
number = {12},
year = {1948},
pages = { 1117-1124},
language = {en},
url = {http://dml.mathdoc.fr/item/1183513320}
}
Ingersoll, Benham M. An initial value problem for hyperbolic
differential equations. Bull. Amer. Math. Soc., Tome 54 (1948) no. 12, pp. 1117-1124. http://gdmltest.u-ga.fr/item/1183513320/