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World News of Natural Sciences > 2017 > 7 > 42-48
Open Physics > 2008 > 6 > 3 > 754-758
Open Physics > 2008 > 6 > 3 > 754-758
World News of Natural Sciences > 2017 > 7 > 42-48
Open Physics > 2008 > 6 > 3 > 754-758
Open Physics > 2008 > 6 > 3 > 754-758