Optical spectroscopy of isolated planetary mass objects in the Orionis clusterD. Barrado y Navascués, M. R. Zapatero Osorio, V. J. S. Béjar, R. Rebolo, E. L. Martín, R. Mundt and C. A. L. Bailer-JonesA&A, 377 2 (2001) L9-L13DOI: https://doi.org/10.1051/0004-6361:20011152
Orionis cluster Orionis cluster