@misc{Sarrau_Émile_Notions_1889,
 author={Sarrau, Émile},
 copyright={Public Domain},
 address={Paris},
 howpublished={online},
 year={1889},
 publisher={Gauthier-Villars et Fils},
 language={fre},
 language={fre},
 title={Notions sur la théorie des quaternions},
 type={Text},
 URL={http://www.rcin.org.pl/Content/13490/PDF/WA35_29837_5299_Notions.pdf},
}