MR1610705 Allegretto, W. and Barabanova, A. W. ALLEGRETTO and A. BARABANOVA Existence of positive solutions of semilinear elliptic equations with nonlocal terms Funkcialaj Ekvacioj. Serio Internacia 40 1997 395--409 http://fe.math.kobe-u.ac.jp/FE/Free/vol40/fe40-3-4.pdf http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE35-40-en_KML/fe40-395-409/fe40-395-409.pdf http://www.ams.org/mathscinet-getitem?mr=MR1610705 fe40-395-409 1997 Existence of Positive Solutions of Semilinear Elliptic Equations with Nonlocal Terms ALLEGRETTO, W.; BARABANOVA, A. ALLEGRETTO, W.; BARABANOVA, A.
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