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Todor Popov
Sofia University
Aleksey Nikolov
Technical University of Sofia
Tsvetan Hristov
Manfred Schneider
Karlsruhe Institute of Technology
Petio Kelevedjiev
Allen M. Tesdall
City University of New York
Kevin R. Payne
University of Milan
Rudolf Scherer
Donal O'Regan
National University of Ireland
Barbara Lee Keyfitz
University of Houston
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