Eremenko, V.; Feodosyev, S.; Gospodarev, I.; Sirenko, V.; Shvedun, M.; McCallum, W.; Tovar, M. Negative Thermal Expansion of HTSC-Type structures:Low Temperature Structure Measurementson Eu_1+x(Ba_1-yR_y)_2-xCu₃O_7-d Compounds and Theoretical Treatment. Fiz. Nizk. Temp. 2005, 31, 350-355.