CEF nature of the magnetic excitations in ordered HoNi2B2CN. Cavadini, Th. Strässle, P. Allenspach, P. C. Canfield and Ph. BourgesEur. Phys. J. B, 29 3 (2002) 377-384DOI: https://doi.org/10.1140/epjb/e2002-00321-8