Using a specially constructed cone and the fixed point index theory, this work shows existence and nonexistence results of positive solutions for fourth-order boundary value problem with two different parameters in Banach spaces.
Jingjing Cai. Guilong Liu. "Positive Solutions for a Class of Fourth-Order Boundary Value Problems in Banach Spaces." Abstr. Appl. Anal. 2011 1 - 8, 2011. https://doi.org/10.1155/2011/831730