@misc{Langevin_Paul_(1872–1946)_La_1950,
 author={Langevin, Paul (1872–1946)},
 copyright={Public Domain},
 address={Paris},
 howpublished={online},
 year={1950},
 publisher={CNRS},
 language={fre},
 type={Text},
 title={La directivité en acoustique sous-marine, Bull. Ass. Tecgn. Maritime et Aéronautique, juin 1931, p. 1},
 URL={http://www.rcin.org.pl/Content/196568/PDF/WA35_226880_8818_Art41.pdf},
}