Langridge, J. M., M. S. Richardson, D. A. Lack, D. C. Law, and D. Murphy (2011), Aircraft Instrument for Comprehensive Characterization of Aerosol Optical Properties, Part I: Wavelength-­‐Dependent Optical Extinction and Its Relative Humidity Dependence Measured Using Cavity Ringdown Spectroscopy, Aerosol Sci. Tech., 45, 1305-1318, doi:10.1080/02786826.2011.592745.