@misc{Siedlecka_Urszula_Vibration, author={Siedlecka Urszula and Zamorska Izabela and Kukla Stanisław}, howpublished={online}, publisher={Wydaw. Politechniki Częstochowskiej}, language={eng}, type={artykuł}, title={Vibration analysis of composite circular and annular membranes}, keywords={composite membrane, free vibration, Green's functions}, }