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Authors
de Sousa, Robert
Minhós, Feliz
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Funding
Funding for this research was provided by:
Fundação para a Ciência e a Tecnologia (UID/MAT/04674/2013 (CIMA))
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Article History
Received: 3 October 2018
Accepted: 6 January 2019
First Online: 14 January 2019
Competing interests
: There are no competing interests.
