... would like to mention someresults of Anderson and Minh´os 11 and He and Su 12, which motivated us to consider theBVP 1.1 and 1.2.In 11, Anderson and Minh´os studied the following ... assumptions A1 and B1 on the nonlinear term,without demanding the existence of upper and lower solutions, we present conditions for theBVP 1.1 and 1.2 to have a unique solution and then study ... ∞ → 0, ∞ is continuous and nondecreasing, and there exists θ ∈ 0, 1 such thatwκy ≥ κθwy for κ ∈ 0, 1 and y ∈ 0, ∞,then, for any λ ∈ 0, ∞,theBVP1.3 and 1.2 has a unique positive...