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World News of Natural Sciences > 2016 > 3 > 19-25
World News of Natural Sciences > 2015 > 2 > 1-6
Roczniki Geomatyki > 2005 > T. 3, z. 3 > 89-93
World News of Natural Sciences > 2016 > 3 > 19-25
World News of Natural Sciences > 2015 > 2 > 1-6
Roczniki Geomatyki > 2005 > T. 3, z. 3 > 89-93