@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 de la fonction perturbatrice ( Bull. astron., T. 14, 1897, p. 449-466 )},
 URL={http://www.rcin.org.pl/Content/212910/PDF/WA35_240630_6642-8_Art3.pdf},
}