Measurements of the collision properties of small spheres by S. F. Foerster and others (1994, 10.1063/1.868282)

Author-hosted excerpt: grainflowresearch.mae.cornell.edu/impact/excerpts/impacts1.pdf

Physics of Fluids 6(3), 1108–1115. Verified byline: S. F. Foerster, M. Y. Louge, H. Chang and K. Allia. The excerpt's abstract describes free-fall release without initial spin and stroboscopic trajectory measurements; its Table 1 reports normal restitution and frictional and tangential restitution properties for glass and acetate spheres. The collision researcher H. Chang is kept distinct from the helium-correlation author of the same initials.