[[VIII-10]] Withrow, S. R. “Angels on Radar Scopes,” Air Weather Service Bulletin (September 1954), pp. 48–51.

[[VIII-11]] Atlas, D. “Radar Studies of Meteorological ‘Angel’ Echoes,” Journal of Atmospheric and Terrestrial Physics, Vol. XV (1959), pp. 262–87.

[[VIII-12]] —— “Possible Key to the Dilemma of Meteorological ‘Angel’ Echoes,” Journal of Meteorology, Vol. XVII (1960), pp. 95–103.

[[VIII-13]] —— “Sub-horizon Radar Echoes by Scatter Propagation,” Journal of Geophysical Research, Vol. LXIV (1959), pp. 1205–18.

[[VIII-14]] Richardson, R. E.; Stacey, J. M.; Kohler, H. M.; and Naka, F. R., “Radar Observations of Birds,” Proceedings of the Seventh Weather Radar Conference (November 1958).

[[VIII-15]] Harper, W. G. “Angels on Centimetric Radars Caused by Birds,” Nature, Vol. CLXXX (1957), p. 847.

[[VIII-16]] Ligda, M. G. H. “Radar Observations of Blackbird Flights,” Texas Journal of Science (December 1958).

[[VIII-17]] Holzer, R., and Smith, W. (Eds.), Proceedings on the Conference on Atmospheric Electricity, Geophysics Research Directorate, Air Force Cambridge Research Center, AFCRC-TR-55-222 (December 1955).

[[VIII-18]] Eastwood, E; Bell, J. D.; and Phelp, N. R. “‘Ring Angels’ over Southeast England,” Nature, Vol. CLXXXIII (1959), pp. 1759–60.