@misc{Poincaré_Henri_(1854–1912)_Observations_1952,
 author={Poincaré, Henri (1854–1912) and Sémirot, Pierre.},
 address={Paris},
 howpublished={online},
 year={1952},
 publisher={Gauthier-Villars},
 language={fre},
 title={Observations au sujet de l'article précédent (Bull. astron., t. 18, 1901, p. 406-420)},
 type={Text},
 URL={http://rcin.org.pl/Content/215194/PDF/WA35_240678_6642-8_Art33.pdf},
}