1. A. Härmä, Implementation of recursive filters having delay free loops, Proceedings of the ICASSP’98, Seattle, Vol. III, 1998, pp. 1261–1264.
2. A. Härmä, U.K. Laine, M. Karjalainen, Backward adaptive warped lattice for wideband stereo coding, Proceedings of EUSIPCO’98, Rhodes, 1998.
3. A. Härmä, M. Vaalgamaa, U.K. Laine, A warped linear predictive stereo codec using temporal noise shaping, Proceedings of IEEE Nordic Signal Processing Symposium NORSIG’98, Denmark, 1998, pp. 229–232.
4. M. Karjalainen et al., Warped filters and their audio applications, IEEE WASPAA’97, New Paltz, New York, 1997.