Arola, ?A., Schuster, ?G., Myhre, ?G., Kazadzis, ?S., Dey, ?S., and Tripathi, ?S.?N.: Inferring absorbing organic carbon content from AERONET data, Atmospheric Chemistry and Physics Vol 10 p.18365-18388 Doi: 10.5194/acpd-10-18365-2010, 2010