8[1]Jianquan Qi, Zhilun Gui. The PTCR effect in BaTiO3 ceramics modified by donor dopant [J]. Ceramics International, 2002, 28: 141-143.
9[3]Zeming He, J. Ma. Effect of additives on the electrical properties of a (Ba0.92Sr0.08)TiO3 based positive temperature coefficient resisitor. [J]. Journal of the European Ceramic Society, 2002, 22: 2143-2148.
10[4]Dongxiang Zhou, Minghe Cao, Shuping Gong. A nove method of preparing Ba0.96Ca0.04Ti1.02O3 ceramics with low room temperature resisitivity [J]. Materials Science and Engineering, 2003, B99: 399-402.
