Contributions to time varying spectrum estimation using the instantaneous power spectrum (IPS). - Ralph D. Hippenstiel; Paulo M. Oliveira (ICASSP, 1989)

Time-varying spectral estimation using the instantaneous power spectrum (IPS). - Ralph D. Hippenstiel; Paulo M. Oliveira (IEEE Trans. Acoust. Speech Signal Process., 1990)

On the concept of instantaneous frequency. - Paulo M. Oliveira; Victor Barroso (ICASSP, 1998)

Sequential extraction of components of multicomponent PPS signals. - Paulo M. Oliveira; Victor A. N. Barroso (ICASSP, 1999)

Instantaneous frequency of multicomponent signals. - Paulo M. Oliveira; Victor A. N. Barroso (IEEE Signal Process. Lett., 1999)

Definitions of Instantaneous Frequency under physical constraints. - Paulo M. Oliveira; Victor Barroso (J. Frankl. Inst., 2000)

Mutual relation between instantaneous frequency and instantaneous bandwidth. - Paulo M. Oliveira; Victor Barroso (ISSPA, 2001)