1. J. Kollár and S. Mori, Birational Geometry of Algebraic Varieties, Cambridge Tracts in Math. 134, Cambridge Univ. Press, Cambridge, 1998.
2. H. Clemens, J. Kollár, and S. Mori, Higher-Dimensional Complex Geometry, Astérisque 166, Soc. Math. France, Montrouge, 1988.
3. M. Artin and J.-L. Verdier, Reflexive modules over rational double points, Math. Ann. 270 (1985), 79–82.
4. M. Auslander and O. Goldman, Maximal orders, Trans. Amer. Math. Soc. 97 (1960), 1–24.
5. A. I. Bondal and M. M. Kapranov, Representable functors, Serre functors, and reconstructions (in Russian), Izv. Akad. Nauk SSSR Ser. Mat. 53, no. 6 (1989), 1183-1205., 1337