1. D. M. Crothers, Accts. Chem. Res., 2, 225 (1969).
2. R. M. Wartell and E. W. Montroll, Adv. Chem. Phys., 22, 130 (1972).
3. D. Poland and H. A. Scheraga, ‘Theory of Helix Coil in Biopolymers’, ( Academic Press, New York, 1970 ).
4. R. Thomas, Biochim, Biophys. Acta, 14, 231 (1954).
5. S. A. Rice and P. Doty, J. Amer. Chem. Soc., 79, 3937 (1957).