Crystal-field and superposition model analysis of R3+:BaY2F8 (R = Er, Dy, Nd)N. Magnani, G. Amoretti, A. Baraldi and R. CapellettiEur. Phys. J. B, 29 1 (2002) 79-84DOI: https://doi.org/10.1140/epjb/e2002-00264-0