A. Bruckl, K. Neumaier, D. Einzel, K. Andres, S. Flaschin, GM. Kalvius, G. Nakamoto, T. Takabatake: Low temperature specific heat of the Kondo-semimetal CeNiSn in zero and applied magnetic fields. 1999Journal of Low Temperature Physics: 115. ISBN 0022-2291 http://dx.doi.org/10.1023/A:1021883621341