Picado, Jorge http://orcid.org/0000-0001-7837-1221
Pultr, Aleš
Funding for this research was provided by:
Centro de Matemática, Universidade de Coimbra (UIDB/00324/2020)
Univerzita Karlova v Praze
Article History
Received: 29 June 2020
Accepted: 25 October 2020
First Online: 19 November 2020