1. Wang, T.P. (1981). Optimal design of digital control systems. Proc. of bilateral seminor on control systems sponsored by IEEE control system society and chinese association for automation. Shanghai.
2. Yang, R.L. (1985). Optimal design of digital servo and a software package for CAD of high accuracy and high speed servo — HAHSS. MS thesis. Beijing institute of technology.
3. Structured design: fundamentals of a discipline of computer program and systems design;Yourdon,1978
4. Man-machine communication;Meadow,1970
5. Structured analysis;Weinherg,1979