Time signal distribution in communication networks based on synchronous digital hierarchy. - Atsushi Imaoka; Masami Kihara (IEEE Trans. Commun., 1997)

Accurate time/frequency transfer method using bidirectional WDM transmission. - Atsushi Imaoka; Masami Kihara (IEEE Trans. Instrum. Meas., 1998)

Two-way time transfer through 2.4 Gb/s optical SDH system. - Masami Kihara; Atsushi Imaoka; Michito Imae; Kuniyasu Imamura (IEEE Trans. Instrum. Meas., 2001)