1. E. L. Eliel, S. H. Wilen, Stereochemistry of Organic Compounds, Wiley, New York, 1994.
2. E. Juaristi, Conformational Behavior of Six-Membered Rings, VCH, New York, 1995.
3. G. Favini, J. Mol. Struct.: THEOCHEM, 1983, 10, 139.
4. J. F. Kleun, J. C. Pommelet, J.Chuche, Can. J Chem., 1993, 71, 410.
5. H. Cold, A. Ax, L. Vrang, B. Samuelsson, A. Karlen, A. Hallberg, M. Larhed, Tetrahedron, 2006, 62, 4671.