by Ceballos, Juan Carlos, Sepúlveda, Mauricio, Vera Villagrán, Octavio Paulo
Published in Applied mathematics and computation (01.07.2007)

by Díaz, Roberto, Vera Villagrán, Octavio Paulo
Published in Electronic journal of qualitative theory of differential equations (01.01.2017)

by Octavio Paulo Vera Villagran
Published in Electronic journal of differential equations (17.05.2004)

by da Silva Alves, Margareth, Vera Villagrán, Octavio Paulo
Published in Indagationes mathematicae (2009)

by Jimenez, S., Vera, Octavio Paulo
Published in Electronic journal of qualitative theory of differential equations (01.01.2011)

by Eleni Bisognin, Vanilde Bisognin, Octavio Paulo Vera Villagran
Published in Electronic journal of differential equations (01.01.2007)

by VILLAGRAN, Octavio Paulo Vera, BISOGNIN, Vanilde
Published in Turkish journal of mathematics (01.01.2007)

by VERA VILLAGRÁN, OCTAVIO PAULO
Published in Proyecciones (Antofagasta) (01.12.2000)

by Jose Diaz Polanco, Octavio Paulo Vera Villagrán
Published in Journal of Computational Mathematica (31.05.2022)

by Juan Carlos Ceballos V., Ricardo Pavez F., Octavio Paulo Vera V.
Published in Electronic journal of differential equations (31.10.2005)

by Kozakevicius, Alice, Vera, Octavio Paulo
Published in Electronic journal of qualitative theory of differential equations (2005)