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The Physics of Protoplanetesimal Dust Agglomerates. VIII. Microgravity Collisions between Porous SiO2 Aggregates and Loosely Bound Agglomerates, Akbar D. Whizin, Jürgen Blum, and Joshua E. Colwell Published 2017 February 10 The Astrophysical Journal, Volume 836, Number 1