1. P. Alku, T. Bakstrom, E. Vikman, Normalized amplitude quotient for parameterization of the glottal flow. J. Acoust. Soc. Am. 112(2), 701–710 (2002)
2. D. Arifianto, T. Tanaka, T. Masuko, T. Kobayashi, Robust F0 estimation of speech signal using harmonicity measure based on instantaneous frequency. IEICE Trans. Inf. Syst. E87–D(12), 2812–2820 (2004)
3. P. Bagshaw, S. M. Hiller, M. A. Jack, Enhanced Pitch Tracking and the Processing of FQ Contours for Computer and Intonation Teaching, in Proceedings of Eurospeech, (1993), pp. 1003–1006
4. Y. Bayya, D.N. Gowda, Spectro-temporal analysis of speech signals using zero-time windowing and group delay function. Speech Commun. 55(6), 782–795 (2013)
5. P. Boersma, Accurate Short-Term Analysis of Fundamental Frequency and the Harmonics-To-Noise Ratio of a Sampled Sound, in Proceedings of the Institute of Phonetic Sciences, vol. 17 (1993), p. 97–110