MathSciNet bibliographic data MR425839 53C40 (58G99) Bleecker, David D.; Weiner, Joel L. Extrinsic bounds on $\lambda \sb{1}$$\lambda \sb{1}$ of $\Delta$$\Delta$ on a compact manifold. Comment. Math. Helv. 51 (1976), no. 4, 601–609. Article

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