TY JOUR TI COMPLEX CLASSIFIERS OF FORMAL CLASSIFICATION THEORY OF TECHNICAL SYSTEMS: HIERARCHO-MATRIX, ZONE, CYCLIC KW technical systems KW classification KW formal theory KW energy objects and systems JO Vestnik of Astrakhan State Technical University. Series: Management, computer science and informatics AU Fedorova, N.V. PY 2021 IS PB Astrakhan State Technical University