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Journal of Air Transport Management > 2002 > 8 > 2 > 115-120
International Journal of Research in Marketing > 2000 > 17 > 2-3 > 215-225
Journal of Air Transport Management > 2002 > 8 > 2 > 115-120
International Journal of Research in Marketing > 2000 > 17 > 2-3 > 215-225