@misc{Fermat_Pierre_de_(1601–1665)_Descartes_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={Descartes à Mersenne > 18 janvier 1638},
 URL={http://www.rcin.org.pl/impan/Content/180000/PDF/WA35_198519_12629-2_Art30.pdf},
}