TY  - JOUR
AU  - E. Śliwiński
TI  - On some estimation of the first eigenvalue of the membrane equation
JO  - Commentationes Mathematicae
PY  - 1969
SP  -  273
EP  - 276
VL  - 12
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.14708/cm.v12i2.5150/
DO  - 10.14708/cm.v12i2.5150
LA  - pl
ID  - 10_14708_cm_v12i2_5150
ER  -