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@article{MZ_1975__143_172234, author = {Shiu-Yuen Cheng}, title = {Eigenvalue {Comparison} {Theorems} and {Its} {Geometric} {Applications.}}, journal = {Mathematische Zeitschrift}, pages = {289--297}, publisher = {mathdoc}, volume = {143}, year = {1975}, zbl = {0329.53035}, url = {http://geodesic.mathdoc.fr/item/MZ_1975__143_172234/} }
Shiu-Yuen Cheng. Eigenvalue Comparison Theorems and Its Geometric Applications.. Mathematische Zeitschrift, Tome 143 (1975), pp. 289-297. http://geodesic.mathdoc.fr/item/MZ_1975__143_172234/