TY  - JOUR
AU  - Sadao Sato
TI  - Barta's Inequalities and the First Eigenvalue of a Cap Domain of a 2-Sphere.
JO  - Mathematische Zeitschrift
PY  - 1982
SP  - 313
EP  - 318
VL  - 181
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1982__181_173235/
ID  - MZ_1982__181_173235
ER  -