@article{GDZPPN002345439,
title = {Existence Proofs for Mixed Problems for Hyperbolic Differential Equations in Two Independent Variables by Means of the Continuity Method.},
journal = {Mathematica Scandinavica},
volume = {6},
year = {1958},
pages = {5-32},
zbl = {0089.30204},
url = {http://dml.mathdoc.fr/item/GDZPPN002345439}
}
Thomée, Vidar. Existence Proofs for Mixed Problems for Hyperbolic Differential Equations in Two Independent Variables by Means of the Continuity Method.. Mathematica Scandinavica, Tome 6 (1958) pp. 5-32. http://gdmltest.u-ga.fr/item/GDZPPN002345439/