00527naa#a2200181#i#450# EN\RIOR\bibl\6298 20240424011545.3 2409-6024 20150430b2015####ek#y0engy0150####ca RUS RU Design of the structure of regional energy system based on data envelopment model Journal article Moscow Publishing Center RIOR 2015 7 с. Journal article local Ratnyer Svyetlana Ratner Pavel riorpub.com