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New Astronomy > 1998 > 3 > 7 > 419-425
Open Physics > 2015 > 13 > 1
Open Physics > 2015 > 13 > 1
Open Physics > 2008 > 6 > 2 > 185-193
Open Physics > 2008 > 6 > 2 > 185-193
Central European Journal of Physics > 2008 > 6 > 2 > 185-193