“…In the case of bounded W, positive solutions of (1.2) are obtained by Brézis and Nirenberg [10], Guedda and Véron [17], García Azorero and Peral Alonso [15], BenNaoum, Troestler and Willem [7], and Silva and Xavier [21]. Further, Benci and Cerami [6], Gonçalves and Alves [16], Ambrosetti, Garcia Azorero and Peral [2,3], and Silva and Soares [20] have studied the case of W ¼ R N .…”