Unified research on the optical and EPR spectral data for the Cr3+ ion in the low-temperature trigonal phase of a LaAlO3 crystalGang Liu, Xin-Xin Zhang, Yang Mei and Wen-Chen ZhengEur. Phys. J. Appl. Phys., 71 3 (2015) 30701DOI: https://doi.org/10.1051/epjap/2015150193