Funding for this research was provided by:
Istituto Nazionale di Fisica Nucleare (Iniziativa Specifica ST&FI, PRIN “Non-perturbative Aspects Of Gauge Theories and Strings”)
Istituto Nazionale di Fisica Nucleare (Iniziativa Specifica GAST, PRIN “Geometria delle varietà algebriche”)
Article History
Received: 24 November 2020
Accepted: 15 February 2021
First Online: 31 March 2021