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Humphreys, D A; Grosche, G*; Petersen, J C*; Henningsen, J*; Eggert, M*; Skipper, B F* (2005) Transmission of active optical reference signals over a 16 channel, 534.4 km WDM optical fibre network. In: OFMC 2005 - 7th Optical Fibre Measurement Conference, 21-23 September 2005, NPL. UK.