1. N. Levinson, "The Wiener RMS error criterion in filter design and prediction," Appendix B of N. Wiener’s book Extrapolation, Interpolation, and Smoothing Stationary Time Series with Engineering Applications, Wiley, New York, 1949, pp. 129-148.
2. Recursive solution to the multichannel filtering problem;Wiggins, Ralph A.;J. Geophys. Res.,1965
3. The triangular decomposition of Hankel matrices;Phillips, James L.;Math. Comp.,1971
4. The factorization of operator valued functions;Devinatz, Allen;Ann. of Math. (2),1961
5. Ein direktes Iterationsverfahren zur Hurwitz-Zerlegung eines Polynoms;Bauer, Friedrich L.;Arch. Elek. \"{U}bertr.,1955