Re-examination of high pressure orthorhombic-I phase of ZrO2 by Raman spectroscopy T.R. Ravindran and Kanchan Yadav Eur. Phys. J. B, 88 1 (2015) 24 Published online: 19 January 2015 DOI: 10.1140/epjb/e2014-50803-y