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@article{MZ_1982__181_173235, author = {Sadao Sato}, title = {Barta's {Inequalities} and the {First} {Eigenvalue} of a {Cap} {Domain} of a {2-Sphere.}}, journal = {Mathematische Zeitschrift}, pages = {313--318}, publisher = {mathdoc}, volume = {181}, year = {1982}, zbl = {0498.53034}, url = {http://geodesic.mathdoc.fr/item/MZ_1982__181_173235/} }
Sadao Sato. Barta's Inequalities and the First Eigenvalue of a Cap Domain of a 2-Sphere.. Mathematische Zeitschrift, Tome 181 (1982), pp. 313-318. http://geodesic.mathdoc.fr/item/MZ_1982__181_173235/