1. S. Abe, J. T. Sheridan. Phys. Lett. A 253, 317 (1999).
2. R. Abeyaratne. Int. J. Mech. Eng. Educ. 17, 53 (1989).
3. D. Acheson. Proc. R. Soc. Lond. A 443, 239 (1993).
4. D. Acheson. From Calculus to Chaos, Oxford University Press, Oxford, 1997.
5. C. Adlard, E. R. Pike, S. Sarkar. arXiv:quant-ph/9107027 (1997).