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V. Krishna Rao, K.; V. Nagender Naidu, S.; Iyengar, Leela . (1967). Thermal Expansion of Tetragonal Phase of VO <sub/>2</sub>. Journal of the Physical Society of Japan, 23(6), 1380–1382. doi:10.1143/JPSJ.23.1380 
10.1143/JPSJ.23.1380