00577naa#a2200193#i#450# EN\\bibl\80661 20241121182436.4 2076-0655 20140925b2014####ek#y0engy0150####ca RUS RU Substandard sand in the technology of glass materials for construction purposes Journal article Moscow Individual Entrepreneur Svetlana Vasilievna Samchenko 2014 3 с. Journal article local Min’ko N I Yakh’ya M Kemenov S A tsilicates.ru