1. Ditchfield, C.R., and England, T.S.: Passive detection at Q band, 1955 April),RRE Memorandum No. 1124
2. Garnham, R.M., and Graham, N.T.W.: Flight trials with the Green Minnow equipment, 1958 August),RRE Memorandum No. 1461
3. Kraus, J.D.: Radio astronomy, (McGraw-Hill, New York 1966)