1. Pierce , J. A. “Radux”-Cruft Laboratory, Harvard University, Tech Report No. 17 Jul 1947
2. “The Diurnal Carrier-phase Variation of a 16-kilocycle Transatlantic Signal”;Pierce;Proc. IRE.,May 1955
3. “VLF Propagation Measurements of the Radux-Omega Navigation System”;Casselman;Proc. IRE.,May 1959
4. “The Radux-Omega long-range Navigation System”;Casselman;Proc. Second Natl. Conv. on Military Electronics,Jun 1958
5. Navy Electronics Laboratory Report 1185 Accuracy of the Omega Navigation System by M. L. Tibbals and D. P. Heritage 2 Oct 1963