Photometric brown-dwarf classification - I. A method to identify and accurately classify large samples of brown dwarfs without spectroscopyN. Skrzypek, S. J. Warren, J. K. Faherty, D. J. Mortlock, A. J. Burgasser and P. C. HewettA&A, 574 (2015) A78DOI: https://doi.org/10.1051/0004-6361/201424570