The substellar mass function in σ Orionis - II. Optical, near-infrared and IRAC/Spitzer photometry of young cluster brown dwarfs and planetary-mass objects
J. A. Caballero, V. J. S. Béjar, R. Rebolo, J. Eislöffel, M. R. Zapatero Osorio, R. Mundt, D. Barrado y Navascués, G. Bihain, C. A. L. Bailer-Jones, T. Forveille and E. L. Martín
