@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}, type={Text}, title={Physical foundations of ultrasonics research trends and its application in Poland}, URL={http://rcin.org.pl./Content/5365/PDF/WA727_9040_57134-06-1981_Physical-founda.pdf}, keywords={Akustyka molekularna}, }