1. For reviews and many references see, for example: I.I. Bigi: On charm and beauty decays—a theorist's perspective. Talk presented at the International Symposium on Production and Decay of Heavy Flavours, Stanford (1987), SLAC-PUB-4455; E.H. Throndike, R.A. Poling: Decays of theb-quark, UR-1022, submitted to Phys. Rep. (1987);
2. M. Wirbel: Prog. Part. Nucl. Phys. 21 (1988) 33
3. See, for example Thorndike and Poling: [1] Prog. Part. Nucl. Phys. 21 (1988) 33
4. D. Hitlin: Weak decays of charmed quarks. An experimental review. Lectures presented at the Charm Physics Symposium/Workshop, Beijing (1987), CALT-68-1463
5. A. Ali: Z. Phys. C—Particles and Fields 1 (1979) 25