Local degeneration of the moduli space of vector bundles and factorization of rank two theta functions. I. Georgios Daskalopoulos; R. Wentworth — 1993 Mathematische Annalen
Factorization of rank two theta functions. II. Proof of the Verlinde formula. R. Wentworth; G. Daskalopoulos — 1996 Mathematische Annalen