Planetesimal formation by sweep-up: how the bouncing barrier can be beneficial to growth F. Windmark, T. Birnstiel, C. Güttler, J. Blum, C. P. Dullemond and Th. Henning A&A, 540 (2012) A73 Published online: 28 March 2012 DOI: 10.1051/0004-6361/201118475