Borges, M. R. http://orcid.org/0000-0002-9566-6731
Pereira, F.
Funding for this research was provided by:
Division of Mathematical Sciences (1514808)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (237760/2012-6 and 400169/2014-2)
Article History
Received: 17 July 2017
Accepted: 28 May 2020
First Online: 25 June 2020