Michaelides, Panayotis G. and Belegri-Roboli, Athena and Marinos, Theocharis (2008): Technical Efficiency in International Air Transport.
Michaelides, Panayotis G. and Belegri-Roboli, Athena and Marinos, Theocharis and Kavouridis, Kostas (2009): Are Trolley Buses in Athens and Piraeus technically efficient?
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