1. Abramowitz, M., and Stegun, I. A., eds. (1965).Handbook of Mathematical Functions, Dover, New York.
2. Achter, E. K., and Meyer, L. (1969).Physical Review 188, 291.
3. Anderson, P. W. (1966). InQuantum Fluids, Proceedings of the Sussex University Symposium, 16?20 August 1965, D. F. Brewer, ed., pp. 146?173, North-Holland, Amsterdam
4. Aziz, R. A., Nain, V. P. S., Carley, J. S., Taylor, W. L., and McConville, G. T. (1979).Journal of Chemical Physics,70, 4330.
5. Bardeen, J., Cooper, L. N., and Schrieffer, J. R. (1957).Physical Review,108, 1175.