On the Number of Solutions of Some Semilinear Elliptic Problems
Bollettino della Unione matematica italiana, Série 9, Tome 4 (2011) no. 3, pp. 313-319

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We show that a class of semilinear boundary value problems possess exactly one positive solution and one negative solution.
Ambrosetti, Antonio. On the Number of Solutions of Some Semilinear Elliptic Problems. Bollettino della Unione matematica italiana, Série 9, Tome 4 (2011) no. 3, pp. 313-319. http://geodesic.mathdoc.fr/item/BUMI_2011_9_4_3_a0/
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     year = {2011},
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     mrnumber = {2906763},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_2011_9_4_3_a0/}
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