T. Tanaka, T. Yazawa, Y. Ohki, M. Ochi, M. Harada, T. Imai, 2007, Frequency Accelerated
                           Partial Discharge Resistance of Epoxy/Clay Nanocomposite Prepared by Newly Developed
                           Organic Modification and Solybilization Methods, IEEE Intern. Conf. Solid Dielectrics
                           (ICSD), Winchester, UK, pp. 337-340
