Funding for this research was provided by:
Oberwolfach Foundation (R1548, R1548, R1548)
Fundação para a Ciência e a Tecnologia (UID/MAT/00324/2019, CEECIND/04092/2017)
Article History
Received: 16 December 2019
Accepted: 15 September 2020
First Online: 29 October 2020