Electrical and Dielectric Properties of Zn$_\mathsf{0.8}$Co$_\mathsf{0.2}$Fe$_\mathsf{2}$O$_\mathsf{4}$
and
J. Phys. III France, 5 6 (1995) 775-781
DOI: 10.1051/jp3:1995103
