“…(1) S u n , G e and Z h a o [17], applying the monotone iterative technique and without the assumption of the existence of lower and upper solutions, obtained the existence of positive solutions for the BVP ⎧ ⎨ ⎩ [φ(x (t))] + q(t)f (t, x(t), x (t)) = 0, t∈ (0, 1), x(0) − αx (ξ) = 0, x (1) + βx(η) = 0 (2) and the iterative schemes for approximating the solutions.…”