@misc{Langevin_Paul_(1872–1946)_Sur_1950,
 author={Langevin, Paul (1872–1946)},
 copyright={Public Domain},
 address={Paris},
 howpublished={online},
 year={1950},
 publisher={CNRS},
 language={fre},
 type={Text},
 title={Sur un problème d'activation par diffusion, J. de Physique et Radium, 1934, 5, 57},
 URL={http://rcin.org.pl./Content/195779/PDF/WA35_226780_8818_Art28.pdf},
}