Orthogonal sets of data windows constructed from trigonometric polynomials. - Charles A. Greenhall (IEEE Trans. Acoust. Speech Signal Process., 1990)

Spectral ambiguity of Allan variance. - Charles A. Greenhall (IEEE Trans. Instrum. Meas., 1998)

A Digital Signal Processing Instrument for Real-Time Phase Noise Measurement. - Leopoldo Angrisani; Rosario Schiano Lo Moriello; Mauro D'Arco; Charles A. Greenhall (IEEE Trans. Instrum. Meas., 2008)