Size/Mass Dependence of Elasticity in Collisions of Icy Spheres, J. P. Dilley, Bull. Am. Ast. Soc. 26, 1141 (1994)

New Measurements of the Coefficient of Restitution for Collisions of Icy Spheres, J. P. Dilley, Bull. Am. Ast. Soc. 25, 1102 (1993)

Energy Loss in Collisions of Icy Spheres: Loss Mechanism and Size-Mass Dependence, J. P. Dilley, Icarus 105, 225 (1993)