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Literature 
[9] Raasch J: 
System development with structured methods. Published by Carl Hanser Verlag, Munich; Vienna 
(1993). 
[10] McMenamin S M/Palmer J F: 
Essential systems analysis. Yourdon Press, New York (1984). 
[11] DeMarco T: 
Structured analysis and system specification. Prentice Hall, Englewood Cliffs, N.J., 1979.