1. Cheltsov, I.: Nonrationality of a four-dimensional smooth complete intersection of a quadric and a quadric not containing a plane. Sb. Math. 194, 1679–1699 (2003)
2. Corti, A.: Factorizing birational maps of threefolds after Sarkisov. J. Alg. Geometry 4, 223–254 (1995)
3. Corti, A.: Singularities of linear systems and 3-fold birational geometry. L.M.S. Lecture Note Series 281, 259–312 (2000)
4. Dolgachev, I.: Weighted projective varieties. Lecture Notes in Mathematics 956, 34–71 (1982)
5. Iskovskikh, V.: Birational automorphisms of three-dimensional algebraic varieties. J. Soviet Math. 13, 815–868 (1980)