Yu, Xue Gang; Yu, Xue Qian Hyperbolic complex functions and the theory of relativity. (Chinese) Zbl 0900.51005 Acta Math. Sci. (Chin. Ed.) 15, No. 4, 435-441 (1995). Cited in 1 Document MSC: 51P05 Classical or axiomatic geometry and physics 83A05 Special relativity PDFBibTeX XMLCite \textit{X. G. Yu} and \textit{X. Q. Yu}, Acta Math. Sci. (Chin. Ed.) 15, No. 4, 435--441 (1995; Zbl 0900.51005)