@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. 126, 1898, p. 370-373)},
 URL={http://www.rcin.org.pl/Content/212913/PDF/WA35_240631_6642-8_Art4.pdf},
}