Sedlacek, A. J., E. Lewis, T. Onasch, P. Zuidema, J. Redemann, D. Jaffee, and L. Kleinman (2021), Black Carbon Particle Mixing State Analysis Allows Classification of Biomass Burn Aerosol Lifecycle into Three Aging Regimes, Proc. Natl. Acad. Sci., 2021-12527.