F. Auger & P. Flandrin. Improving the readability of time-frequency and time-scale representations by the reassignment method. IEEE Transactions on Signal Processing. May 1995, 43 (5): 1068–1089. doi:10.1109/78.382394.
K. Kodera; R. Gendrin & C. de Villedary. Analysis of time-varying signals with small BT values. IEEE Transactions on Acoustics, Speech and Signal Processing. Feb 1978, 26 (1): 64–76. doi:10.1109/TASSP.1978.1163047.
D. J. Nelson. Cross-spectral methods for processing speech. Journal of the Acoustical Society of America. Nov 2001, 110 (5): 2575–2592. doi:10.1121/1.1402616.