00570naa#a2200169#i#450# EN\\bibl\46394 20240428011207.7 2072-9502 20211029b2021####ek#y0engy0150####ca RU COMPLEX CLASSIFIERS OF FORMAL CLASSIFICATION THEORY OF TECHNICAL SYSTEMS: HIERARCHO-MATRIX, ZONE, CYCLIC Journal article Astrakhan Astrakhan State Technical University 2021 13 с. Journal article local Математика. 51 Fedorova Natalia Vasilyevna vestnik.astu.org