@misc{Kukla_Stanisław_green’s,
 author={Kukla Stanisław},
 howpublished={online},
 publisher={Wydaw. Politechniki Częstochowskiej},
 language={eng},
 title={green’s function for vibration problems of an elliptical membrane},
 type={artykuł},
 keywords={Fukcje Greena, Green's functions},
}