Fabien Millioz Nadine Martin Circularity of the STFT and Spectral Kurtosis for Time-Frequency Segmentation in Gaussian Environment. 515-524 2011 59 IEEE Trans. Signal Process. 2 https://doi.org/10.1109/TSP.2010.2081986 db/journals/tsp/tsp59.html#MilliozM11