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Liski, J.; Mäkivirta, A.; Välimäki, V. (2018). Audibility of loudspeaker group-delay characteristics(PDF). 144th Audio Engineering Society International Convention, Paper Number 10008. Audio Engineering Society. pp. 879–888. Archived(PDF) from the original on 2022-10-09. Retrieved 2022-05-21.
Bariska, Andor (2008). "Negative Group Delay"(PDF). Physical Meaning of Negative Group Delay?. Archived(PDF) from the original on 2021-10-16. Retrieved 2022-10-28.