@misc{Langevin_Paul_(1872–1946)_Les_1950,
 author={Langevin, Paul (1872–1946)},
 copyright={Public Domain},
 address={Paris},
 howpublished={online},
 year={1950},
 publisher={CNRS},
 language={fre},
 type={Text},
 title={Les aspects successifs du principe de relativité, Bull. Soc. fr. Physique, 1920, 138, 5},
 URL={http://www.rcin.org.pl/impan/Content/195756/PDF/WA35_226773_8818_Art22.pdf},
}