Fiber-Optic Time Transfer for UTC-Traceable Synchronization for Telecom Networks. - Lukasz Sliwczynski; Przemyslaw Krehlik; Jacek Kolodziej; Helmut Imlau; Horst Ender; Harald Schnatz; Dirk Piester; Andreas Bauch (IEEE Commun. Stand. Mag., 2017)

Fiber-Based UTC Dissemination Supporting 5G Telecommunications Networks. - Lukasz Sliwczynski; Przemyslaw Krehlik; Helmut Imlau; Horst Ender; Harald Schnatz; Dirk Piester; Andreas Bauch (IEEE Commun. Mag., 2020)

cnPRTC - Coherent Network Primary Reference Time Clock: A Geographically Distributed Resilient Timescale for Telecommunications. - Lee Cosart; Helmut Imlau; George P. Zampetti (IEEE Commun. Mag., 2023)