1. Fourier-series techniques applied to distance protection;McLaren;IEE Proc,1975
2. Limits to impedance relaying;Thorp;IEEE Trans Power Apparatus Syst,1979
3. Digitaler Netzschutz: Verhalten der Algorithmen bei nichtidealen Eingangssignalen;Nelles,1991
4. Error insensitive distance protection;Opperskalski;ETEP,1992
5. Hou D, Guzmán A, Roberts J. Innovative solutions improve transmission line protection. Proceedings, 24th Annual Western Protective Relay Conference, Spokane, USA; October 21–23, 1997.