@article{02217104,
title = {The role of the Lagrange constant in some nonlinear waves equations.},
journal = {Rendiconti del Seminario Matematico},
volume = {57},
year = {1999},
pages = {175-184},
zbl = {1098.35549},
language = {en},
url = {http://dml.mathdoc.fr/item/02217104}
}
Ben-Naoum, Abdou Kouider. The role of the Lagrange constant in some nonlinear waves equations.. Rendiconti del Seminario Matematico, Tome 57 (1999) pp. 175-184. http://gdmltest.u-ga.fr/item/02217104/