Some aspects of the electrical and thermal properties of ammonium hydrogen tartrate - Abdel-Kader, M. M.; Ei-Tanahy, Z. H.; Abdel-Razik, A.; Abutaleb, M.; El-Shawarby, A. (Springer, 1995)
http://dx.doi.org/10.1007/BF00190551
Keywords: ZN; ZL