The paper presents the existence result for positive solutions of the differential equation (g(x))" = f(t, x, (g(x))') satisfying the nonlocal boundary conditions x(0) = x(T), min{x(t) : t E J} = 0. Here the positive function f satisfies local Caratheodory conditions on [0, T] x (0, infinity) x (R\{0}) and f may be singular at the value 0 of both its phase variables. Existence results are proved by Leray-Schauder degree theory and Vitali's convergence theorem
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