A positive fixed point theorem with applications to systems of   Hammerstein integral equations
  We present new criteria on the existence of fixed points that combine some monotonicity assumptions with the classical fixed point index theory. As an illustrative application, we use our theoretical results to prove the existence of positive solutions for systems of nonlinear Hammerstein integral equations. An example is also presented to show the applicability of our results. 
Alberto Cabada, Jos\'e \'Angel Cid and Gennaro Infante
math.CA