Where online versions are available, the link is provided on the title.
Evans, T.R., and L.C. Drickamer. 1994. Flight speeds of birds determined using Doppler radar. Wilson Bulletin 106: 154-156. [traffic radar]
Gauthreaux, Jr., S.A. 1974. The detection, quantification, and monitoring of bird movements aloft with airport surveillance radar (ASR). Pp. 298-307 in S.A. Gauthreaux, Jr. (editor). Proceedings of a Conference on the Biological Aspects of the Bird/Aircraft Collision Problem, Clemson University, Clemson, SC.
Gauthreaux, Jr., S.A., and J.W. Livingston. 2006. Monitoring bird migration with a fixed-beam radar and a thermal-imaging camera. Journal of Field Ornithology 77: 319-328.
Graber, R.R., and S.S. Hassler. 1962. The effectiveness of aircraft-type (APS) radar in detecting birds. Wilson Bulletin 74:367-380.
Hassler, S.S., R.R. Graber, and F.C. Bellrose. 1963. Fall migration and weather, a radar study. Wilson Bulletin 75: 56-77. [airport radar]
Larkin, R.P. 1991. Flight speeds observed with radar, a correction: slow “birds” are insects. Behavioral Ecology and Sociobiology 29: 221-224. [pencil beam]