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2. Environmental change, species' coping ability and biodiversity value;Bezabih,2007
3. Bortier-Verstraaten, M.B. (2002), A bioeconomic analysis of the ghanaian tuna fishery (1980–2000), unpublished MSc Dissertation, Norwegian College of Fishery Science, University of Tromsø, Norway.
4. Valuing biodiversity from an economic perspective: a unified economic, ecological, and genetic approach;Brock;American Economic Review,2003
5. Observed changes in the species composition of tuna schools in the Gulf of Guinea between 1981 and 1999, in relation with the fish aggregating device fishery;Fonteneau;Aquatic Living Resources,2000