Costarelli, Danilo http://orcid.org/0000-0001-8834-8877
Vinti, Gianluca
Funding for this research was provided by:
Istituto Nazionale di Alta Matematica “Francesco Severi”
Department of Mathematics and Computer Science of the University of Perugia
Article History
Received: 14 September 2017
Accepted: 2 December 2017
First Online: 2 February 2018