An estimate of the gap of the first two eigenvalues in the Schrödinger operator
I. M. Singer, Bun Wong, Shing-Tung Yau, Stephen S.-T. Yau (1985)
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
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An estimate of the gap of the first two eigenvalues in the Schrödinger operator
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