@Article{acpd-7-93-2007, AUTHOR = {Eleftheratos, K. and Zerefos, C. S. and Zanis, P. and Balis, D. S. and Tselioudis, G. and Gierens, K. and Sausen, R.}, TITLE = {A twenty-year study on natural and manmade global interannual fluctuations of cirrus cloud cover}, JOURNAL = {Atmospheric Chemistry and Physics Discussions}, VOLUME = {7}, YEAR = {2007}, NUMBER = {1}, PAGES = {93--126}, URL = {http://www.atmos-chem-phys-discuss.net/7/93/2007/}, ISSN = {1680-7367} }