Funding for this research was provided by:
National Group for Algebraic and Geometric Structure, and their Applications (GNSAGA-INdAM)
National Science Centre (2016/21/N/ST1/01491)
Ministerio de EconomÃa y Competitividad (MDM-2014-0445)
Article History
Received: 6 May 2018
Accepted: 3 January 2019
First Online: 23 January 2019
Free to read: This content has been made available to all.