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London: Faber and Faber, 1974
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Montreal: Internat. Air Transport Assoc., 1969
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München: VVF, 1990
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London; Philadelphia; New Delhi: Kogan Page, 2016
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Farnham [u.a.]: Ashgate, 2011
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Berlin: Duncker & Humblot, 1972
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Boston [u.a.]: Butterworth-Heinemann, 1991
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Bochum: Geograph. Institut der Ruhr-Univ., 1987
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Frankfurt am Main: Metzner, 1985
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Milton Park, Abingdon, Oxon; New York: Routledge, [2017]
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Farnham [u.a.]: Ashgate, c 2011
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Bingley: Emerald Group Publ., 2014
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London [u.a.]: Routledge, 2011
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Berlin: Duncker und Humblot, 1984
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Vallendar: WHU - Otto Beisheim School of Management, 2022
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Bingley, U.K.: Emerald, 2014
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Karlsruhe: KIT Scientific Publishing, 2012
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Bingley, U.K.: Emerald Publishing Limited, 2022
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Boston ;Berlin: De|G Press, [2018]