Multiplicity of Solutions for Elliptic Problems with Critical Exponent or with a Nonsymmetric Term
J. Garcia Azorero, I. Peral Alonso · Transactions of the American Mathematical Society · 1991
J. Garcia Azorero, I. Peral Alonso, Multiplicity of Solutions for Elliptic Problems with Critical Exponent or with a Nonsymmetric Term, Transactions of the American Mathematical Society, Vol. 323, No. 2 (Feb., 1991), pp. 877-895