Multi-conjugate adaptive optics images of the Trapezium cluster H. Bouy, J. Kolb, E. Marchetti, E. L. Martín, N. Huélamo and D. Barrado y Navascués A&A, 477 2 (2008) 681-690 Published online: 23 October 2007 DOI: 10.1051/0004-6361:20078599