1. (a) M.M. Pellegrin, Rec. Trav. Chim. 18 (1899) 457-465
2. (b) C.J. Brown, A.C. Farthing, Nature 164 (1949) 915-916
3. (c) D.J. Cram, H. Steinberg, J. Am. Chem. Soc. 73 (1951) 5691-5704.
4. (a) D.J. Cram, J.M. Cram, Acc. Chem. Res. 4 (1971) 204–213; (b) F. Vӧgtle, Cyclophane Chemistry, Wiley, Chichester, 1993.
5. For a review on chiral cyclophanes see: R. Gleiter, H. Hopf, Modern Cyclophane Chemistry, Wiley-VCH, Weinheim, 2004.