1. Cook, J. J., and Terhune, R. W., “Radio Astronomy Masers: Test and Operational Facility”, Willow Run Laboratories Technical Memorandum, May 1960.
2. Cook, J. J., Cross, L. G., Bair, M. E., and Terhune, R. W., “A Low Noise X-Band Radiometer, Using Maser”, submitted for publication in Proc. Inst. Rad. Eng.
3. Bair, M. E., Barrett, A. H., Cook, J. J., Cross, L. G., and Terhune, R. W., “Preliminary Results with a Maser Radiometer at 3.45 cm.”, presented at the AAS meeting, Pittsburg, Pennsylvania, April 18–21, 1960, and to be published in Astron. J.
4. Allen, C. W., “Astrophysical Quantities” (Athlone Press, London, 1955).
5. Drake, F. D., and Ewen, H. I., Proc. Inst. Rad. Eng., 46, 53 (1958).