author = { International Civil Aviation Organization },

title = { Traffic by flight stage = Trafic par étapes = Tráfico por etapas },

publisher = {ICAO},

keywords = { Luftverkehr , Statistik , Welt , Graue Literatur , Zeitschrift },

year = {1977-},

booktitle = {Digest of statistics / International Civil Aviation organization / International Civil Aviation organization ; Series TF},

address = { Montreal },

url = { http://slubdd.de/katalog?TN_libero_mab2 }