1. Petrovsky, A.B.: Mul’timnozhestva kak model’ predstavleniya mnogopriznakovykh ob”yektov v prinyatii resheniy i raspoznavanii obrazov (Multisets as a model for representation of multi-attribute objects in decision making and pattern recognition). Iskusstvenniy Intellect (Artificial Intelligence) 2, 236–243 (2002). (in Russian)
2. Petrovsky, A.B.: Inconsistent preferences in verbal decision analysis. In: Papers from IFIP WG8.3 International Conference on Creativity and Innovation in Decision Making and Decision Support, vol. 2, pp. 773–789. Ludic Publishing Ltd, London (2006)
3. Petrovsky, A.B.: Multiple criteria decision making: discordant preferences and problem description. J. Syst. Sci. Syst. Eng. 16(1), 22–33 (2007)
4. Petrovsky, A.B.: Group verbal decision analysis. In: Encyclopedia of decision making and decision support technologies, vol. 1, pp. 418–425. Hershey, New York, IGI Global (2008)
5. Petrovsky, A.B.: Clustering and sorting multi-attribute objects in multiset metric space. In: The Forth International IEEE Conference on Intelligent Systems. Proceedings, vol. 2, pp. 11–44–11–48. Sofia, IEEE (2008)