(2,2)-VACUA, FREE FERMIONS AND GROUPFOLDS
The following sections are included:
Compactification on Abstract (2,2)-Super-Conformal Field Theories
(2,2)9,9-Theories on Groupfolds
The Free Fermion Construction of 4D Superstring Vacua
Classification of the (2,2)-Vacua Corresponding to Class I Groupfolds
References