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World News of Natural Sciences > 2021 > 34 > 82-87
Acta Societatis Metheoriticae Polonorum > 2016 > 7 > 13-16
Acta Societatis Metheoriticae Polonorum > 2015 > 6 > 23-25
World News of Natural Sciences > 2021 > 34 > 82-87
Acta Societatis Metheoriticae Polonorum > 2016 > 7 > 13-16
Acta Societatis Metheoriticae Polonorum > 2015 > 6 > 23-25