A 2.4 kbps high-quality speech coder. - Jesper Haagen; Henrik Nielsen; Steffen Duus Hansen (ICASSP, 1991)

Improvements in 2.4 kbps high-quality speech coding. - Jesper Haagen; Henrik Nielsen; Steffen Duus Hansen (ICASSP, 1992)

Transformation and decomposition of the speech signal for coding. - W. Bastiaan Kleijn; Jesper Haagen (IEEE Signal Process. Lett., 1994)

A speech coder based on decomposition of characteristic waveforms. - W. Bastiaan Kleijn; Jesper Haagen (ICASSP, 1995)