Long term lidar measurements of aerosol properties over thessalonikiNikolaos Siomos, Kalliopi A. Voudouri, Eleni Giannakaki, Vasilis Amiridis, Maria Filioglou, Alexandros Papayannis and Dimitris S. BalisEPJ Web Conf., 176 (2018) 05033DOI: https://doi.org/10.1051/epjconf/201817605033