Schnatz, H., Terra, O., Predehl, K., Feldmann, T., Legero, T., Lipphardt, B., Sterr, U., Grosche, G., Holzwarth, R., Hänsch, T. W., Udem, T., Lu, Z. H. H., Wang, L. J., Ertmer, W., Friebe, J., Pape, A., Rasel, E.-M., Riedmann, M., & Wubbena, T. (2010). Phase-Coherent Frequency Comparison of Optical Clocks Using a Telecommunication Fiber Link. IEEE Transactions on Ultrasonics Ferroelectris and Frequency Control, 57(1 Sp. Iss. Sp. Iss. SI), 175-181. doi:10.1109/TUFFC.2010.1395.