1. [A] V. Alexeev, General elephants for Mori fiber spaces, preprint, 1991.
2. [I1]1 V. A. Iskovskih, Fano threefolds. I, Izv. Akad. Nauk SSSR Ser. Mat. 41 (1977), no. 3, 516–562, 717.
3. [I1]2 V. A. Iskovskih, Fano threefolds. II, Izv. Akad. Nauk SSSR Ser. Mat. 42 (1978), no. 3, 506–549.
4. [I2] V. A. Iskovskih, Lectures on algebraic threefolds, Fano varieties, Moscow University, 1988.
5. [KMM] Y. Kawamata, K. Matsuda, and K. Matsuki, Introduction to the minimal model problem, Algebraic geometry, Sendai, 1985, Adv. Stud. Pure Math., vol. 10, North-Holland, Amsterdam, 1987, pp. 283–360.