Funding for this research was provided by:
Fundação para a Ciência e a Tecnologia (PTDC/MAT-STA/28649/2017)
Fundação para a Ciência e a Tecnologia
Article History
Received: 15 October 2020
Revised: 7 August 2021
Accepted: 9 August 2021
First Online: 15 November 2021