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Source:
Chemistry. Bulgarian Journal of Chemical Education; 2015, Vol. 24 Issue 4, p521-531, 11p
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Source:
Mathematics & Informatics; 2018, Vol. 61 Issue 2, p175-189, 15p
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Review of the Bulgarian Geological Society; 2019, Vol. 80 Issue 3, p48-50, 3p
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Review of the Bulgarian Geological Society; 2019, Vol. 80 Issue 3, p33-35, 3p
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Mathematics & Informatics; 2017, Vol. 60 Issue 1, p64-80, 17p
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