00539naa#a2200181#i#450# EN\\bibl\80725 20241121210535.4 2076-0655 20160625b2016####ek#y0engy0150####ca RUS RU The concentration of electrons as a structural characteristic of oxides Journal article Moscow Individual Entrepreneur Svetlana Vasilievna Samchenko 2016 6 с. Journal article local Molchan N V Fertikov V I tsilicates.ru