Improved varistor nonlinearity via sintering and acceptor impurity doping Y. J. Wang, J. F. Wang, C. P. Li, H. C. Chen, W. B. Su, W. L. Zhong, P. L. Zhang and L. Y. Zhao Eur. Phys. J. AP, 11 3 (2000) 155-158 Published online: 15 September 2000 DOI: 10.1051/epjap:2000157