00551naa#a2200193#i#450# EN\\bibl\80704 20241105012418.2 2076-0655 20151225b2015####ek#y0engy0150####ca RUS RU Degree of polycondensation and alkalinity of water glasses Journal article Moscow Individual Entrepreneur Svetlana Vasilievna Samchenko 2015 6 с. Journal article local Ivanov N K Ivanov K S Radaev S S tsilicates.ru