[1] Xong Xijin, Wide complex analysis, Journal of Wuhan University, 1 (1980), 26～29. (in Chinese).
[2] Yu Xuegang and Cui Jingmao, Hyperbolic quantum mechanics, Journal of Songliao, 4 (1995), 1～6. (in Chinese).
[3] Yu Xuegang and Ma Longjun, The summary of the hyperbolic complex functional analysis, Journal of Tonghua Teachers' College,4 (1993), 30～34. (in Chinese).
[4] Yu Xuegang and Yu Xueqian, Hyperbolic complex analysis and the theory of relativity,Journal of Mathematics Physics,15, 4 (199), 435～441. (in Chinese).
[5] Yu Xuegang and Gao Junli, Hyperbolic tensor analysis, Proceedings of the 2nd International Conference on Nonlinear Mechanics, Peking University Press (1993), 883～884.