A novel method for pitch extraction from speech and a hardware model applicable to vocoder systems. - Robert J. Sluyter; H. J. Kotmans; A. V. Leeuwaarden (ICASSP, 1980)

Improvements of the harmonic-sieve pitch extraction scheme and an appropriate method for voiced-unvoiced detection. - Robert J. Sluyter; H. J. Kotmans; Theo A. C. M. Claasen (ICASSP, 1982)