Cecotti, SergioVafa, Cumrun2019-09-221993Cecotti, Sergio, and Cumrun Vafa. 1993. βOn Classification ofN=2 Supersymmetric Theories.β Communications in Mathematical Physics 158 (3): 569β644. https://doi.org/10.1007/bf02096804.0010-36161432-0916http://nrs.harvard.edu/urn-3:HUL.InstRepos:41385092en-USOn classification ofN=2 supersymmetric theoriesJournal Article2019-09-2210.1007/BF02096804