Bessa, Mário http://orcid.org/0000-0002-1758-2225
Morais, Pedro
Funding for this research was provided by:
Fundação para a Ciência e a Tecnologia (UID/MAT/00212/2013, UID/MAT/00212/2013)
Fundação para a Ciência e a Tecnologia (PTDC/MAT-PUR/29126/2017)
Article History
Received: 28 November 2018
First Online: 29 June 2019