Gegenwart, P., Langhammer, C., Geibel, C., Helfrich, R., Lang, M., Sparn, G., et al. (1998). Breakup of Heavy Fermions on the Brink of "Phase A" in CeCu2Si2. Physical Review Letters, 81(7), 1501-1504. doi:10.1103/PhysRevLett.81.1501.