@misc{Poincaré_Henri_(1854–1912)_Sur_1952,
 author={Poincaré, Henri (1854–1912) and Sémirot, Pierre.},
 address={Paris},
 howpublished={online},
 year={1952},
 publisher={Gauthier-Villars},
 language={fre},
 type={Text},
 title={Sur le développement approché de la fonction perturbatrice ( C. R. Acad. Sc., t. 112, 1891, p. 269-273 )},
 URL={http://rcin.org.pl./Content/212908/PDF/WA35_240629_6642-8_Art2.pdf},
}