The ELDORA/ASTRAIA airborne Doppler weather radar: goals, design, and first field tests. - Peter H. Hildebrand; Craig A. Walther; Charles L. Frush; Jacques Testud; Francois Baudin (Proc. IEEE, 1994)

Design of a bistatic dual-Doppler radar for retrieving vector winds using one transmitter and a remote low-gain passive receiver. - Joshua Wurman; Mitch Randall; Charles L. Frush; Eric Loew; Christopher L. Holloway (Proc. IEEE, 1994)