1. P. Biolcheva, Project risk management opportunities for entering artificial intelligence, 2021, UNWE, ISBN 978-619-232-507-7.
2. Diffusion of innovation in the Bulgarian dairy industry
3. P. McCorduck, Machines Who Think: A Personal Inquiry into the History and Prospects of Artificial Intelligence, A K Peters/CRC Press, 2nd edition, 2004, p. 598.
4. J. McCarthy, P. Hayes, Some Philosophical Problems from the Standpoint of Artificial Intelligence, In: Meltzer, B.and Michie, D., Eds., Machine Intelligence, Volume 4, 1969, Edinburgh University Press, Edinburgh, 463–502, https://www-formal.stanford.edu/jmc/mcchay69.pdf
5. D. Dobrev, Artificial Intelligence – definition, implementation and consequences, Bulgarian Academy of Sciences, 2018, p. 131.