@misc{Szmidla_Janusz_Free,
 author={Szmidla Janusz and Cieślińska-Gąsior, Ilona},
 howpublished={online},
 publisher={Wydaw. Politechniki Częstochowskiej},
 language={eng},
 type={artykuł},
 title={Free vibrations of column locally resting on the Winkler elastic foundation under the specific load},
 keywords={critical load, Winkler elastic foundation, free vibrations},
}