McDavid, A. W.; McMullen, C. D. (2006-10-30). "Generalizing Cross Products and Maxwell's Equations to Universal Extra Dimensions". arXiv:hep-ph/0609260.
Arfken, George Brown (2005). Mathematical methods for physicists. Weber, Hans-Jurgen (6th ed.). Boston: Elsevier. p. 43. ISBN978-0-08-047069-6. OCLC127114279.