On the analytic signal, the Teager-Kaiser energy algorithm, and other methods for defining amplitude and frequency. - David Vakman (IEEE Trans. Signal Process., 1996)

On an ambiguity in the definition of the amplitude and phase of a signal. - Leon Cohen; Patrick J. Loughlin; David Vakman (Signal Process., 1999)

Time-frequency analysis as asymptotic method. - David Vakman (J. Frankl. Inst., 2003)