Spectral analysis of high resolution near-infrared spectra of ultra cool dwarfs Y. Lyubchik, H. R. A. Jones, Y. V. Pavlenko, E. Martin, I. S. McLean, L. Prato, R. J. Barber and J. Tennyson A&A, 473 1 (2007) 257-264 Published online: 16 July 2007 DOI: 10.1051/0004-6361:20065386