1. T. Nomura, A. Nakano, Proceedings of the Sixth International Conference on Ferrites (ICF6), Tokyo and Kyoto, Japan, The Japan Society of Powder and Metallurgy, 1992, pp. 1198–1201.
2. K. Yasuda, Y. Mochizuki, M. Takaya, Proceedings of the Eighth International Conference on Ferrites (ICF8), Kyoto and Tokyo, Japan, The Japan Society of Powder and Metallurgy, 2000, pp. 1162–1164.
3. Low-Fire NiO–CuO–ZnO Ferrite with Bi2O3
4. Ni-Cu-Zn Ferrites for low temperature firing: II. Effects of powder morphology and Bi2O3 addition on microstructure and permeability
5. J. Smit, H.J. Wijn, Ferrites, Philips Technical Library, Eindhoven, The Netherlands (10962), 1962, pp. 316–320.