1. P. Krogsgaard-Larsen, G. A. R. Johnston, D. R. Curtis, D. C. Game, and R. M. McCulloch, ?Structure and biological activity of a series of conformationally restricted analogues of GABA,? J. Neurochem., 25, No. 10, 803?809 (1975).
2. M. J. Azanza and R. J. Walker, ?GAMA-receptor interactions; models in Helix aspersa neurons,? Comp. Biochem. Physiol., 50C, No. 2, 155?161 (1975).
3. A. M. Liquori, A. M. Damiani, and J. L. De Coen, ?Calculation of minimum energy conformation of acetylcholine,? J. Mol. Biol., 33, No. 2, 445?450 (1968).
4. L. B. Kier, ?Molecular orbital calculation of preferred conformation of acetylcholine, muscarine, and muscarone,? J. Mol. Pharmacol., 3, No. 2, 487?494 (1967).
5. B. S. Zhorov, E. V. Rozengart, V. A. Govyrin, N. V. Khromov-Borisov, and N. B. Brovtsina, ?Theoretical conformational analysis of several choline-esterase substrates with a cyclic structure of the ammonium group,? Mol. Biol., 9, No. 6, 820?827 (1975).