P. Woodland, J. Odell, V. Valtchev, and S. Young. Proceedings of the 1994 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2, page 125-128. Adelaide, Australia, (April 1994)
S. Lilly, and C. Carollo. (2016)cite arxiv:1604.06459Comment: 17 pages of text plus 13 figures. Submitted to The Astrophysical Journal on April 18 2016.