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    • Monotone iterations for differential equations with a parameter 

      Jankowski, Tadeusz; Lakshmikantham, V. (1997)
      Consider the problem {y′(t)=f(t,y(t),λ),t∈J=[0,b],y(0)=k0,G(y,λ)=0. Employing the method of upper and lower solutions and the monotone iterative technique, existence of extremal solutions for the above equation are proved.