00556naa#a2200169#i#4500001001500000005001700015011001400032100004100046102000700087200011300094210005800207215001100265608002700276675002900303700003300332856002100365EN\\bibl\4348420240424121831.3##a2072-9502##a20210415b2021####ek#y0engy0150####ca##aRU1#aPRINCIPLES OF FORMAL CLASSIFICATION THEORY  OF TECHNICAL SYSTEMS: CASE OF ENERGY FACILITIESeJournal article1#aAstrakhancAstrakhan State Technical Universityd2021##a12 с.##aJournal article2local##aМатематика. 51#1aFedorovagNatalia Vasilyevna4#avestnik.astu.org