Duarte, Pedro
Klein, Silvius
Funding for this research was provided by:
Fundação para a Ciência e a Tecnologia (UID/MAT/04561/2013, PTDC/MAT-PUR/29126/2017)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (306369/2017-6)
Article History
Received: 5 February 2019
Accepted: 10 August 2019
First Online: 11 October 2019