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oai:rcin.org.pl:114336 2020-10-02T15:45:05Z rcin.org.pl rcin.org.pl:literature:journalArticles rcin.org.pl:partnerCollections:ippt rcin.org.pl:partnerCollections:ippt:serials rcin.org.pl:partnerCollections:ippt:serials:archivesofmechanics rcin.org.pl:literature rcin.org.pl:partnerCollections