1. Chapter 8;M. Abramowitz,1972
2. Yu. M. Aponin and E. A. Aponina, “On some conditions of stable supporting of unstable plasmids in microbe populations under continuous cultivation,” in Studies on Mathematical Biology, Ed. by E. E. Shnol’ (Pushchino, Moscow oblast, 1996), p. 78.
3. Yu. M. Aponin, E. A. Aponina, and E. A. Vanyakin, “Mathematical modeling of continuous cultivation processes taking into account heterogeneity of microbe populations,” (ONTI NTsBI Akad. Nauk SSSR, Pushchino, Moscow oblast, 1984).
4. A. D. Bazykin, Mathematical Biophysics of Interacting Populations (Nauka, Moscow, 1985).
5. H. Bateman and A. Erdélyi, Higher Transcendental Functions (McGraw-Hill, New York, 1953), Vol. 2.