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Schioppo, M; Kronjaeger, J; Silva, A; Ilieva, R; Paterson, J W; Baynham, C F A; Bowden, W; Hill, I R; Hobson, R; Vianello, A; Dovale- Alvarez, M; Williams, R A; Marra, G; Margolis, H S; Amy-Klein, A; Lopez, O; Cantin, E; Alvarez-Martinez, H; Le Target, R; Pottie, P E; Quintin, N; Legero, T; Hafner, S; Sterr, U; Schwarz, R; Dorscher, S; Lisdat, C; Koke, S; Kuhl, A; Waterholter, T; Benkler, E; Grosche, G (2022) Comparing ultrastable lasers at 7 x 10(-17) fractional frequency instability through a 2220 km optical fibre network. Nature Communications, 13 (1). 212