Crystal structure and vibrational properties of RFe3(BO3)4 (R = Ce – Lu) ferroborate crystal: ab initio calculationsV.P. Petrov, V.A. Chernyshev and A.E. NikiforovEPJ Web Conf., 132 (2017) 03039DOI: https://doi.org/10.1051/epjconf/201713203039