1. Perlmutter P (1992) Conjugate Addition Reactions in Organic Synthesis, Tetrahedron Organic Chemistry Series, vol 9 Pergamon Press, Oxford
2. Tomioka K, Koga K (1983) Asymmetric Synthesis, vol 2, Academic Press, New York, chap 7
3. Posner GH, ibid. chap 8
4. Lutomoski KA, Meyers AI (1984) Asymmetric Synthesis, vol 3, Academic Press, New York chap 3
5. Oppolzer W (1987) Tetrahedron 43: 1969