1985 · H. Sekimoto, H. Nakata, et al. · Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS) · 4
1986 · H. Sekimoto, T. Ihara, et al. · Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)