The Slope Imaging Multi-polarization Photon-counting Lidar: Development and performance results. - Philip W. Dabney; David J. Harding; James B. Abshire; Tim Huss; Gabriel Jodor; Roman Machan; Joe Marzouk; Kurt Rush; Antonios Seas; Christopher Shuman; Xiaoli Sun; Susan Valett; et al. (IGARSS, 2010)