%0 Journal Article
%A Sadao Sato
%T Barta's Inequalities and the First Eigenvalue of a Cap Domain of a 2-Sphere.
%J Mathematische Zeitschrift
%D 1982
%P 313-318
%V 181
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1982__181_173235/
%F MZ_1982__181_173235