1. Abramowitz, M., Stegun, I.A.: “Handbook of Mathematical Functions” New York, Dover, p. 504 (1965)
2. Bessho, C., Kuroda, N.: Bull. Math. Biol. 45, 143–149 (1983)
3. Biebricher, C.K., Eigen, M., Gardiner, W.C.: Biochemistry 22, 2544–2559 (1983)
4. Biebricher, C.K., Eigen, M., Luce, R.: J. Mol. Biol. 148, 369–410 (1981)
5. Courant, R., Hilbert, D.: “Methods of Mathematical Physics” Vol. II, New York, Wiley, Interscience, (1962)