@misc{Werla_Marcin_ECDL,
 author={Werla, Marcin and Dudczak, Adam},
 howpublished={online},
 publisher={PCSS},
 language={eng},
 title={ECDL 2009 Tutorial: Aggregation and Reuse of Digital Objects’ Metadata from Distributed Digital Libraries},
 type={prezentacja},
}