@misc{Holl_R._Focusing_1982,
 author={Holl, R. and Groenig, H. and Holl, R. and Groenig, H.},
 volume={34},
 number={5-6},
 copyright={Creative Commons Attribution BY 4.0 license},
 journal={Archives of Mechanics},
 address={Warszawa},
 howpublished={online},
 year={1982},
 publisher={Polish Scientific Publishers IFTR},
 language={eng},
 language={pol},
 language={rus},
 type={Text},
 title={Focusing of shock waves},
 URL={http://rcin.org.pl/ippt/Content/69188/PDF/WA727_89024_P.262b-Holl-Focusing.pdf},
 keywords={Mechanika stosowana - czasopisma [KABA]},
}