“…By using the fixed point theorem in cones due to Krasnoselskii [3], Wang [1] and Kong and Wang [2] established the existence of one positive solution for (1) subject to one of the following nonlinear boundary conditions: By applying a new twin fixed point theorem due to Avery and Henderson [5], He and Ge [4] obtained the existence of two positive solutions for (1) subject to (w1), (w2), (w3). By using the fixed point theorem in cones due to Krasnoselskii [3], R. P. Agarwal, Haishen Lü and D. O'Regan [6] studied the problem of eigenvalues of (1) subject to (BCa) when B 0 = B 1 = 0, they also obtained the existence of two positive solutions. By using an extension of the Leggett-Williams theorem, i.e., the fixed point theorem of five functionals, Guo and Ge [7] got the existence of three positive solutions for (1) subject to (w1), (w2), (w3), and…”