@misc{Katzer_Jacek_Experimental,
 author={Katzer, Jacek and Kobaka, Janusz},
 address={Koszalin},
 howpublished={online},
 publisher={Politechnika Koszalińska},
 language={eng},
 type={artykuł w czasopiśmie},
 title={Experimental determination of optimum mixture design of lightweight concrete},
 keywords={lightweight aggregate, expanded clay granules, lightweight concrete, properties, research testing},
}