On Fixed Points of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mi>α</mml:mi><mml:mtext>-</mml:mtext><mml:mi>ψ</mml:mi></mml:math>-Contractive Multivalued Mappings in Cone Metric Spaces
Abstract and applied analysis