search query: @freeterm Vertical differentiation / total: 2
references: 1-2 / 2
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| title | year | author | ||
| 1. |
Journal of Air Transport Management
2004 : SEP, VOL. 10:5, p. 333-343 |
2004 | Barbot, C. |
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| 2. |
International Economic Review
2000 : NOV, VOL. 41:4, p. 971-987 |
2000 | Lahmandi-Ayed, R. |
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