1. Alexieva, J., Choy, E., Koycheva, E.: Review and bibliography on generalized nets theory and applications. In: Choy, E., Krawczak, M., Shannon, E., Szmidt, V. (eds.) A Survey of Generalized Nets, Raffles KvB Monograph No. 10, pp. 207–301 (2007)
2. Atanassov, K.: Generalized Nets. World Scientific, Singapore, New Jersey, London (1991)
3. Atanassov, K.: On Generalized Nets Theory, “Prof. M. Drinov” Academic Publishing House, Sofia (2007)
4. Barrett, K.E., Barman, S., Boitano, S., Brooks, H.: Ganong’s Review of Medical Physiology, 25th edn. McGraw-Hill, New York (2016)
5. Dzhambazova, E.: Human Physiology. Climent Ohridski University Publishing House, Soifa (2015).(in Bulgarian)