Freitas, Pedro http://orcid.org/0000-0002-2007-5259
Funding for this research was provided by:
Fundação para a Ciência e a Tecnologia (PTDC/MAT-CAL/4334/2014)
Article History
Received: 14 December 2017
Revised: 29 April 2018
First Online: 10 May 2018