@misc{Malecki_Ignacy_(1912–2004)_Physical_1981,
 author={Malecki, Ignacy (1912–2004) and Ranachowski, Jerzy (1926–2000)},
 copyright={Rights Reserved - Free Access},
 address={Warszawa},
 journal={Prace IPPT IFTR REPORTS},
 howpublished={online},
 year={1981},
 publisher={Instytut Podstawowych Problemów Techniki Polskiej Akademii Nauk},
 language={eng},
 title={Physical foundations of ultrasonics research trends and its application in Poland},
 type={Text},
 URL={http://rcin.org.pl/Content/5365/PDF/WA727_9040_57134-06-1981_Physical-founda.pdf},
 keywords={Akustyka molekularna},
}