S. Koksal & V. Lakshmikantham 
Monotone Flows and Rapid Convergence for Nonlinear Partial Differential Equations [PDF ebook] 

A monotone iterative technique is used to obtain monotone approximate solutions that converge to the solution of nonlinear problems of partial differential equations of elliptic, parabolic and hyperbolic type. This volume describes that technique, which has played a valuable role in unifying a variety of nonlinear problems, particularly when combin