Found in articles
Propagation and Group Velocity. New York: Academic Press Inc., 1960. OCLC:537250 Geoffrey K. Vallis: ”Appendix: Wave Kinematics, Group Velocity and Phase Speed”
14 kg (pelkkä ohjus) Valmistaja: Thales Air Defence (Thales Group) STARStreak High Velocity Missile (Valmistajan esite) 2018. Thales UK. Viitattu 10.3
Kashibadze, O. G.: Masses of the local group and of the M81 group estimated from distortions in the local velocity field. Astrophysics, 2006, 49. vsk, nro
(2002) Oscillons from the Anti-Sun (2005) Fab Four Suture (2006) Serene Velocity: A Stereolab Anthology (2006) Rebecca Raber: Stereolab: Not Music Pitchfork
dualismiin, s. 39–41. Limes, 2005. ISBN 951-745-210-1 Phase, Group, and Signal Velocity Mathpages.com. Viitattu 25.3.2019. Dispersion Encyclopedia Britannica