Accurate pitch determination of speech signals by means of a laryngograph. - Wolfgang J. Hess; Helge Indefrey (ICASSP, 1984)

Design and evaluation of double-transform pitch determination algorithms with nonlinear distortion in the frequency domain-preliminary results. - Helge Indefrey; Wolfgang Hess; Günter Seeser (ICASSP, 1985)

Accurate time-domain pitch determination of speech signals by means of a laryngograph. - Wolfgang Hess; Helge Indefrey (Speech Commun., 1987)

Untersuchung von Algorithmen zur Grundfrequenzbestimmung von Sprachsignalen unter Verwendung des Ausgangssignals eines Laryngographen als Referenzgrösse. - Helge Indefrey (1988)