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Andrea Martocchia (1), Giorgio Matt (1) and Vladimir Karas (2)
1 - Dipartimento di Fisica, Universita' degli Studi "ROMA TRE"
Via della Vasca Navale 84, I--00146 Roma (Italy);
E-mail: martocchia@fis.uniroma3.it, matt@haendel.fis.uniroma3.it2 - Astronomical Institute of the Charles University,
Faculty of Mathematics and Physics,
V Holesovickach 2, CZ--180 00 Praha (Czech Republic);
E-mail: vladimir.karas@mff.cuni.cz