1. A review and applications of VLF and LF transmissions for navigation and tracking;Beukers;Navigation,1974
2. Spread Spectrum Systems;Dixon,1976
3. Optimal binary sequences for spread spectrum multiplexing;Gold;IEEE Trans. on Inf. Theory,1967
4. Low and very-low-frequency hyperbolic techniques;Van Etten;Elect. Commun.,1970
5. Microwave techniques in animal radiotelemetry;Brockelsby,1974