00579naa#a2200169#i#450# EN\\bibl\45335 20240425070907.4 2072-9502 20210726b2021####ek#y0engy0150####ca RU BASIC CLASSIFIERS OF FORMAL CLASSIFICATION THEORY OF TECHNICAL SYSTEMS: HIERARCHIES, VECTORS AND MATRICES, BANDS Journal article Astrakhan Astrakhan State Technical University 2021 12 с. Journal article local Математика. 51 Fedorova Natalia Vasilyevna vestnik.astu.org