00540naa#a2200169#i#4500001001500000005001700015011001400032100004100046102000700087200010500094210005800199215001100257608001900268675002900287700003300316856002100349EN\\bibl\4348420211203183218.5##a2072-9502##a20210415b2021####ek#y0engy0150####ca##aRU1#aPRINCIPLES OF FORMAL CLASSIFICATION THEORY OF TECHNICAL SYSTEMS: CASE OF ENERGY FACILITIESeArticle1#aAstrakhancAstrakhan State Technical Universityd2021##a12 с.##aArticle2local##aМатематика. 51#1aFedorovagNatalia Vasilyevna4#avestnik.astu.org