"Direktionsrecht und Flugreisen - Auswirkungen der Anschläge vom 11. September 2000" [Direction right and air travel - effects of the attacks of September 11]
Direction right and air travel - effects of the attacks of September 11 (only available in German language)
"Betriebs-Berater 2001, S. 2422 ff." [Betriebs-Berater 2001, p. 2422 et seq.]