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Dionyssia Hatzilacou, Feeding Ecology of the Great White Pelican (Pelecanus onocrotalus) Nesting at Lake Mikri Prespa (Northwestern Greece), Colonial Waterbirds, Vol. 19, Special Publication 1: Ecology, Conservation, and Management of Colonial Waterbirds in the Mediterranean Region (1996), pp. 190-206
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Dionyssia Hatzilacou (1996) studied this question.
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