分解型複素数
↑ Mr. J. Cockle on a New Imaginary in Algebra, , London-Edinburgh-Dublin Philosophical Magazine and Journal of Science 34: 37-47, (1849), https://www.biodiversitylibrary.org/item/20121#page/51/mode/1up
↑ Vignaux 1935.
↑ Allen, E. F. (1941), On a Triangle Inscribed in a Rectangular Hyperbola American Mathematical Monthly, 48, pp. 675-681
C. Musès, Applied hypernumbers: Computational concepts, Appl. Math. Comput. 3 (1977) 211–226.
C. Musès, Hypernumbers II—Further concepts and computational applications, Appl. Math. Comput. 4 (1978) 45–66.
K. Carmody, Circular and hyperbolic quaternions, octonions, and sedenions, Appl. Math. Comput. 28:47–72 (1988)
K. Carmody, Circular and hyperbolic quaternions, octonions, and sedenions— further results, Appl. Math. Comput. 84:27–48 (1997)