TY  - JOUR
AU  - Vejvoda, Otto
TI  - Periodic solutions of a weakly nonlinear wave equation in $E_3$ in a spherically symmetrical case
JO  - Applications of Mathematics
PY  - 1969
SP  - 160
EP  - 167
VL  - 14
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/AM.1969.103218/
DO  - 10.21136/AM.1969.103218
LA  - en
ID  - 10_21136_AM_1969_103218
ER  -