Antoniadou, C., Sarantidis, S., Vafidis, D., & Voultsiadou, E. (?????.).  (2006).  POPULATION STRUCTURE OF Paracentrotus lividus Lamark: A PRELIMINARY ASSESSMENT IN TWO AREAS OF THE AEGEAN SEA. ??? 10th International Congress on the Zoogeography and Ecology of Greece and Adjacent Regions. ????????????? ??? 26-30 June, Patra: Hellenic Zoological Society, Hellenic Ornithological Society, Hellenic Ministry of Rural Development, Section of Animal Biology (Dept. Of Biology, Univ. of Patras).