Erich Hoyt, SUSTAINABLE ECOTOURISM ON ATLANTIC ISLANDS, WITH SPECIAL REFERENCE TO WHALE WATCHING, MARINE PROTECTED AREAS AND SANCTUARIES FOR CETACEANS, Biology and Environment: Proceedings of the Royal Irish Academy, Vol. 105B, No. 3, Fauna and Flora of Atlantic Islands (NOVEMBER 2005), pp. 141-154
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Erich Hoyt (2005) studied this question.
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