Publicacións en colaboración con investigadores/as de Universidade de Lisboa (3)


  1. Positivity and lower and upper solutions for fourth order boundary value problems

    Nonlinear Analysis, Theory, Methods and Applications, Vol. 67, Núm. 5, pp. 1599-1612


  1. A positive operator approach to the Neumann problem for a second order ordinary differential equation

    Journal of Mathematical Analysis and Applications, Vol. 204, Núm. 3, pp. 774-785