1971 · B. Capone, A. Kahan, et al. · Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS) · 5
1984 · B. Sawyer, D.R. Kinloch · Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS) · 4