## References 

1. N. Wirth, "The Programmin~ Language Pascal," Acta Informatica, 1,35-63, 1971. 

2. N. Wirth, "Program Deve opment by Stepwise Refinement," Communications of the ACM, P, 221-227, April 1971. 

3. N. Wirth, Systematic Programming, Prentice-Hall, Inc., 1973. 

4. O.J. Dahl, E.W. Dijkstra, C.A.R. Hoare, Structured Programming, Academic Press Inc., 1972. 

5. c.A.R. Hoare and N. Wirth. "An Axiomatic Definition of the Programming Language Pascal," Acta Informatica, 2, 335-355,1973. 

6. D.E. Knuth, The Art oj Computer Programming, Vol 1, Fundamental Algorithms, Addi~ 1.1I1-Wesley, 1968. 

7. N. Wirth, "An Assessment 0 the Programming Language Pascal," SIGPLAN Notices, 10,23-30, Jill!.? 1975. 

