Virtual beams from an FFT beamformer and their use to assess the quality of a towed-array system. - Jean-Louis Berrou; Ronald A. Wagstaff (ICASSP, 1982)

Exploiting Phase Fluctuations to Improve Machine Performance Monitoring. - Suresh Venugopal; Ronald A. Wagstaff; Jagdish P. Sharma (IEEE Trans Autom. Sci. Eng., 2007)