TY  - JOUR
AU  - Popivanov, Nedyu
AU  - Nikolov, Aleksey
TI  - Singular Solutions of Protter’s Problem for a Class of 3-D Hyperbolic Equations
JO  - Mathematics and Education in Mathematics
PY  - 2012
SP  - 191
EP  - 196
VL  - 41
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MEM_2012_41_1_a18/
LA  - en
ID  - MEM_2012_41_1_a18
ER  -