%0 Journal Article
%A E. Śliwiński
%T On some estimation of the first eigenvalue of the membrane equation
%J Commentationes Mathematicae
%D 1969
%P  273-276
%V 12
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.14708/cm.v12i2.5150/
%R 10.14708/cm.v12i2.5150
%G pl
%F 10_14708_cm_v12i2_5150