Evolution of Brown Dwarf Atmospheres: Investigating Physical Parameters   from Near-IR Spectra
  We obtained near-infrared spectra of a sample of very low mass objects as a function of age in order to investigate the temperature and surface gravity sensitivity of several features in the J and K bands. 
Nadya Gorlova, Michael R. Meyer, Jim Liebert, George H. Rieke (Steward   observatory, University of Arizona, USA)