Change of the effective spin degeneracy in CeNi9−xCuxGe4 due to the interplay between Kondo and crystal field effectsL. Peyker, C. Gold, W. Scherer, H. Michor, T. Unruh, G. G. Simeoni, A. Senyshyn, D. T. Adroja, O. Stockert and E.-W. ScheidtEPL, 93 3 (2011) 37006DOI: https://doi.org/10.1209/0295-5075/93/37006