Steglich, F., Gegenwart, P., Geibel, C., Hinze, P., Lang, M., Langhammer, C., et al. (2000). Non-Fermi-liquid effects in stoichiometric 4 f-electron metals at ambient pressure. Physica B, 280, 349-353. doi:10.1016/S0921-4526(99)01736-6.