Guéna, J., Weyers, S., Abgrall, M., Grebing, C., Gerginov, V., Rosenbusch, P., Bize, S., Lipphardt, B., Denker, H., Quintin, N., Raupach, S. M. F., Nicolodi, D., Stefani, F., Chiodo, N., Koke, S., Kuhl, A., Wiotte, F., Meynadier, F., Camisard, E., Chardonnet, C., Le Coq, Y., Lours, M., Santarelli, G., Amy-Klein, A., Le Targat, R., Lopez, O., Pottie, P. E., & Grosche, G. (n.d.). first international comparison of fountain primary frequency standards via a long distance optical fiber link. Metrologia, 54, 348–354. http://access.bl.uk/ark:/81055/vdc_100087643672.0x00005f