Kovacevic , S , Jovcic , D , Rault , P & Schwob , A 2019 , ' Small signal state space model of the frequency-dependent DC cable based on direct vector fitting ' Paper presented at 15th IET International Conference on AC and DC Power Transmission, ACDC 2019 , Coventry , United Kingdom , 5/02/19 - 7/02/19 , .conference