Lidar to determine the fractions of ice, liquid and water vapor in polar tropospheric clouds Gilberto J. Fochesatto, Oscar Galvez, Pablo Ristori, Douglas Keller and Enzo Fochesatto EPJ Web Conf., 176 (2018) 01033 Published online: 13 April 2018 DOI: 10.1051/epjconf/201817601033