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Research supported in part by National Science Foundation grant NCS 79-01780, Mathematical Sciences Research Institute, and the Sloan Foundation.
Research supported in part by National Science Foundation grant 81-20790.
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Croke, C.B., Derdziński, A. A lower bound for λ1 on manifolds with boundaryon manifolds with boundary. Commentarii Mathematici Helvetici 62, 106–121 (1987). https://doi.org/10.1007/BF02564440
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DOI: https://doi.org/10.1007/BF02564440