Academic Editor: Claudianor O. Alves
Copyright © 2010 Xingqiu Zhang and Yujun Cui. This is an open access article distributed under the
Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
By employing upper and lower solutions method together with
maximal principle, we establish a necessary and sufficient condition for the existence of
pseudo- as well as positive solutions for fourth-order singular -Laplacian
differential equations with integral boundary conditions. Our nonlinearity may be
singular at , , and . The dual results for the other integral boundary
condition are also given.