@misc{Lefébure_de_Fourcy_Louis_Etienne_(1785–1869)_Leçons_1850,
 author={Lefébure de Fourcy, Louis Etienne (1785–1869)},
 copyright={Public Domain},
 address={Paris},
 howpublished={online},
 year={1850},
 publisher={Bachelier, Libraire de l'École Polytechnique},
 publisher={(Impr. de Crapelet)},
 language={fre},
 title={Leçons d'algèbre},
 type={Text},
 URL={http://www.rcin.org.pl/Content/67033/PDF/WA35_10658_6468_%20Lecons-dalgebre.pdf},
}