Atomic lines in infrared spectra for ultracool dwarfs Y. Lyubchik, H. R. A. Jones, Y. V. Pavlenko, S. Viti, J. C. Pickering and R. Blackwell-Whitehead A&A, 416 2 (2004) 655-659 Published online: 27 February 2004 DOI: 10.1051/0004-6361:20034419