On uniqueness and successive approximations in the Darboux problem for the equation $u_{xy} = f(x, y, u, u_x, u_y, ∫^x_0 ∫^y_0 g(x, y, s, t, u(s, t), u_s(s, t), u_t(s, t)) ds dt)$
Tom 17 / 1965
Annales Polonici Mathematici 17 (1965), 1-11
DOI: 10.4064/ap-17-1-1-11
