MathSciNet bibliographic data MR1098396 (93a:35114) 35P05 (35J10 47F05) Allegretto, W. Principal eigenvalues for indefinite-weight elliptic problems in ${\bf R}\sp n$${\bf R}\sp n$. Proc. Amer. Math. Soc. 116 (1992), no. 3, 701–706. Article

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