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MR829055 35P15 (35J10 58G25)
Singer, I. M.; Wong, Bun; Yau, Shing-Tung; Yau, Stephen S.-T. An estimate of the gap of the first two eigenvalues in the Schrödinger operator. Ann. Scuola Norm. Sup. Pisa Cl. Sci. (4) 12 (1985), no. 2, 319–333.
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