American Journal of Mathematics 7(4):293 to 326 from Jstor early content. . William Edwin Hamilton (editor) (1866) [https://books.google.com/books?id=fIRAAAAAIAAJ Elements of Quaternions, University of Dublin Press Charles Jasper Joly (editor) (1899) Elements of Quaternions volume I, (1901) volume II, Longmans, Green & Co. Kravchenko, Vladislav (2003), Applied Quaternionic Analysis'', Heldermann Verlag . . . . . . . . . Composition algebras Quaternions Ring theory Special relativity Articles containing proofs William Rowan Hamilton de:Biquaternion#Hamilton Biquaternion