1. A digital computer system or EHV substations: analysis and field tests;Phadke;IEEE Transactions on Power Apparatus and Systems,1976
2. Computer Relaying for Power Systems;Phadke,1988
3. E.O. Schweitzer, D. Hou, Filtering for protective relays, Schweitzer Engineering Laboratories, Pullman, USA, Tech. Rep., 1993.
4. A new half-cycle phasor estimation algorithm;Sidhu;IEEE Transactions on Power Delivery,2005