Bessa, Mário
Silva, César M.
Vilarinho, Helder
Funding for this research was provided by:
Fundação para a Ciência e a Tecnologia (UID/MAT/00212/2013, UID/MAT/00212/2013)
Article History
Received: 23 June 2018
Accepted: 21 September 2018
First Online: 29 September 2018
Compliance with Ethical Standards
:
: The authors declare they have no conflicts of interest.