%0 Journal Article %T Bismuth-containing low-melting glasses and the structural state of bismuth in them %A Bobkova, N.M. %K bismuth-containing borate glasses, thermal expansion, initial softening point, structural bismuth oxygen group, valence state of bismuth %J Technique and technology of silicates %D 2013 %N 20 %P 3 %I Individual Entrepreneur Svetlana Vasilievna Samchenko