Funding for this research was provided by:
“la Caixa” Foundation (LCF/BQ/PI19/11690016.)
Division of Mathematical Sciences (DMS-1207693, DMS-1613819)
Centro de Matemática, Universidade de Coimbra (UID/MAT/00324/ 2019)
Article History
Received: 3 April 2020
Accepted: 11 January 2021
First Online: 2 February 2021