Spectroscopy of Very Low Mass Stars and Brown Dwarfs in the Lambda Orionis Star Forming Region. I. Enlarging the census down to the planetary mass domain in Collinder 69
A. Bayo, D. Barrado, J. Stauffer, M. Morales-Calderon, C. Melo, N. Huelamo, H. Bouy, B. Stelzer, M. Tamura, R. Jayawardhana
http://arxiv.org/abs/1109.4917
