@misc{Fermat_Pierre_de_(1601–1665)_Fermat_1894,
 author={Fermat, Pierre de (1601–1665) and Tannery, Paul (1843–1904) and Henry, Charles (1859–1926) and Gauthier-Villars},
 copyright={Public Domain},
 address={Paris},
 howpublished={online},
 year={1894},
 publisher={Gauthier-Villars, Imprimeurs-Libraires},
 language={fre},
 type={Text},
 title={Fermat à Roberval > 20 avril},
 URL={http://www.rcin.org.pl/Content/179996/PDF/WA35_198508_12629-2_Art26.pdf},
}