Optical properties and vertical extension of aged ash layers over the Eastern Mediterranean as observed by Raman lidars during the Eyjafjallajökull eruption in May 2010 - Papayannis, A.; Mamouri, R. E.; V. Amiridis; Giannakaki, E.; Veselovskii, I; Kokkalis, P.; Tsaknakis, G; Balis, D.; Kristiansen, NI; Stohl, A. (Atmospheric environment, 2012)