Selection algorithm for the CALIPSO lidar aerosol extinction-to-backscatter ratio. - Ali H. Omar; David M. Winker; Jae-Gwang Won; Mark A. Vaughan; Chris A. Hostetler; John A. Reagan (IGARSS, 2003)

Distributions of Aerosol Extinction to Backscatter Ratios Derived from Cluster Analysis of AERONET Data. - Ali H. Omar; Jae-Gwang Won (IGARSS, 2006)