MathSciNet bibliographic data MR1998182 35P05 (31B20 35J25) Bejhaj Rhouma, N. Principal eigenvalues for indefinite weight problems in all of \${\Bbb R}\sp d\$${\Bbb R}\sp d$. Proc. Amer. Math. Soc. 131 (2003), no. 12, 3747–3755. Article

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