2024-03-29T14:00:09Z
https://kpbc.umk.pl/oai-pmh-repository.xml
oai:kpbc.umk.pl:21209
2014-04-17T13:14:54Z
KujawskoPomorskaDigitalLibrary:EducationalMaterials:Mathematics KujawskoPomorskaDigitalLibrary:EducationalMaterials KujawskoPomorskaDigitalLibrary