Institution: | Astronomical Institute, Academy of Sciences of the Czech Republic, Bo?níII, CZ-140 31 Prague, Czech Republic;Charles University, Faculty of Mathematics and Physics, V Hole?ovi?kách 2, CZ-180 00 Prague, Czech Republic;Dipartimento di Fisica, Universitàdegli Studi 'Roma Tre', Via della Vasca Navale 84, I-00146 Rome, Italy |