Brown dwarfs and very low mass stars in the Praesepe open cluster: a dynamically unevolved mass function?S. Boudreault, C. A. L. Bailer-Jones, B. Goldman, T. Henning and J. A. CaballeroA&A, 510 (2010) A27DOI: https://doi.org/10.1051/0004-6361/200913011