Campbell, Murray (2015)
"Bridging the gaps in the harmonic series: Valves, slides and finger holes in brass instruments.,"
in Proceedings of the Third Vienna Talk on Music Acoustics, p. 2-2
edited by Mayer, Alexander; Chatziioannou, Vasileios; Goebl, Werner, Institute Of Music Acoustics (Wiener Klangstil), Vienna, Austria