Multi-particle collisions in microgravity: Coefficient of restitution and sticking threshold for systems of mm-sized particlesJ. Brisset, T. Miletich, J. Metzger, A. Rascon, A. Dove and J. ColwellA&A, 631 (2019) A35DOI: https://doi.org/10.1051/0004-6361/201936228