A rotational and variability study of a large sample of PMS stars in NGC 2264 M. H. Lamm, C. A. L. Bailer-Jones, R. Mundt, W. Herbst and A. Scholz A&A, 417 2 (2004) 557-581 Published online: 19 March 2004 DOI: 10.1051/0004-6361:20035588