1. IV Intern. Conf. on Crystal and Structural Effects in f-Electron Systems;Takegahara,1981
2. Intern. Conf. on Valence Instabilities;Sera,1982
3. Inter. Conf. on Valence Instabilities;Takahashi,1982
4. Intern. Conf. on Valence Instabilities;Kasuya,1982