1. Abramowitz, M.; Stegun, I. A. (1968): Handbook of Mathematical Functions. Dover Publ, N. Y.
2. Adam, B.; Kneubühl, F. K. (1975): Appl. Phys. 8, 281
3. Adams, M. J. (1981): An Introduction of Optical Waveguides. John Wiley, N. Y.
4. Affolter, E.; Kneubühl, F. K. (1981): IEEE J. Quantum Electron. QE-17, 1115
5. Anderson, D. B. (1965): in: Optical and Electrooptical Data Processing (ed. G. Tippet), 221, MIT Press, Cambridge