1. Statistical theory of DF fixing;Stansfield;J. IEE,1947
2. Performance analysis of bearing-only target location algorithms;Gavish;IEEE Trans. Aerospace Electron. Systems,1992
3. D. Koks, Passive geolocation for multiple receivers with no initial state estimate, Defence Science & Technology Organisation, Edinburgh, SA, Australia, Technical Report, DSTO RR-0222, November 2001.
4. Fundamental properties and performance of conventional bearings-only target motion analysis;Nardone;IEEE Trans. Automat. Control,1984
5. Position-location solutions by Taylor-series estimation;Foy;IEEE Trans. Aerospace Electron. Systems,1976