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3. Baltic International Maritime Council (BIMCO); International Shipping Federation (ISF); University of Warwick — Institute of Employment Research:The BIMCO/ISF 2000 manpower update: the world-wide demand for and supply of seafarers: main report. Coventry, University of Warwick, 2000.
4. Policy Research Corporation N.V., Institute of Shipping Economics and Logistics (ISL):Economic Impact of Maritime Industries in Europe. Brussels: European Commission, 2001.
5. Fricke, P. H.:The Social Structure of Crews. Cardiff: Department of Maritime Studies, University of Wales, 1974.