@article{02163655,
title = {New singular solutions of Protter's problem for the 3D wave equation.},
journal = {Abstract and Applied Analysis},
volume = {2004},
year = {2004},
pages = {315-335},
doi = {10.1155/S1085337504306111},
zbl = {1086.35064},
language = {en},
url = {http://dml.mathdoc.fr/item/02163655}
}
Grammatikopoulos, M.K.; Popivanov, N.I.; Popov, T.P. New singular solutions of Protter's problem for the 3D wave equation.. Abstract and Applied Analysis, Tome 2004 (2004) pp. 315-335. doi : 10.1155/S1085337504306111. http://gdmltest.u-ga.fr/item/02163655/