Upgrade of the YerPhI polarization Lidar System for using Polarization of the Elastic and Raman Backscattered BeamsA. Ghalumyan, K. Apresyan, A. Chilingaryan and V. GhazaryanEPJ Web Conf., 197 (2019) 03005DOI: https://doi.org/10.1051/epjconf/201919703005