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December 1977 On the least positive eigenvalue of the Laplacian for Riemannian manifolds
Hajime Urakawa
Proc. Japan Acad. Ser. A Math. Sci. 53(7): 229-231 (December 1977). DOI: 10.3792/pjaa.53.229
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Vol.53 • No. 7 • December 1977
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