Antil, Harbir
Otárola, Enrique
Salgado, Abner J.
Funding for this research was provided by:
Division of Mathematical Sciences (1418784, 1521590)
Fondo Nacional de Desarrollo Científico y Tecnológico (3160201)
Article History
Received: 30 October 2017
Revised: 9 February 2018
Accepted: 22 March 2018
First Online: 28 March 2018