Evidence from stellar rotation of enhanced disc dispersal - I. The case of the triple visual system BD−21 1074 in the β Pictoris associationS. Messina, B. Monard, K. Biazzo, C. H. F. Melo and A. FrascaA&A, 570 (2014) A19DOI: https://doi.org/10.1051/0004-6361/201423832