N. Yasui et al., “Fluctuation strength of tremolo played on the mandolin: How tremolo is evaluated as good?”, Proc. of International Symposium on Performance Science, pp. 431-436(2009).
Carl E. Seashore, “Psychology of Music”, pp. 33-52, McGraw-Hill Co. Inc., 1938.
H. Fastl and E. Zwicker, “Psychoacoustics Facts and Models”, pp. 257-264, Springer-Verlag, Berlin, 1990.
U. Widmann and H. Fastl, “Calculating roughness using time-varying specific loudness spectra”, Proc. of Sound Quality symposium’98, pp. 55-60(1998).