author = { Europäische Kommission Generaldirektion Verkehr },

title = { Validation process for users' requirements in air traffic operations Vaporeto },

publisher = {Office for Official Publ. of the European Communities},

isbn = {9282799751},

keywords = { Europäische Union , Luftverkehr , Flugbetrieb },

year = {1997},

booktitle = {Transport research ; 7,44 : APAS Air transport},

address = { Luxembourg },

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