@misc{Gumen_Olena_Justification,
 author={Gumen Olena and Mileikovskyi Viktor and Dziubenko, Vołodymyr},
 howpublished={online},
 publisher={Wydaw. Politechniki Częstochowskiej},
 language={eng},
 title={Justification of duct shape between two welded films of a film economizer for deep heat utilization},
 type={artykuł},
 keywords={budownictwo, konstrukcje budowlane},
}