Existence of positive solutions for some nonlinear elliptic problems in unbounded domains of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="${\mathbb{R}}^n$" id="E1"><mml:msup><mml:mi>ℝ</mml:mi><mml:mi>n</mml:mi></mml:msup></mml:math>
Abstract and applied analysis