1- In Search of The Laser Eraser (The Economist July 1985).
2- The Computer That Runs on Light ( The Economist July 1985).
3- Building a Parakkel Comuter Means Starting All over Again. (The Economist March 1985).
4- Encyclopedia of Computer Science And Engineering Ralston- Reilly.
5- Guide To GPS Positioning Canadian GPS Associates 1986.
6- Geodesy The Concepts, P.Vanick-E.Kriko. 1987.