Kravtsov, H., O. Dolhorukov, and V. Koshel. “Set-Theoretical Approach to Defining of Terms “classification”, “taxonomy” and ‘ontology’”. Collection "Information Technology and Security", vol. 5, no. 2, Dec. 2017, pp. 59-66, doi:10.20535/2411-1031.2017.5.2.136963.