Koutseri, I., & Catsadorakis, G. (?????.).  (2006).  The Evolution of the Mixed Ardeid-Pygmy Cormorant Colony in Lake Mikri Prespa: 20  Years of Fluctuation, Displacements and Difficult Censuses. ??? 10th International Congress on the Zoogeography and Ecology of Greece and Adjacent Regions. ????????????? ??? 26-30 June, Patras: Hellenic Zoological Society, Hellenic Ornithological Society, Hellenic Ministry of Rural Development, Section of Animal Biology (Dept. Of Biology, Univ. of Patras).