1. An Assessment of Techniques for Proving Program Correctness
2. DAHL O.-J. ET AL Structured programming Academic Press London and New York 1972. DAHL O.-J. ET AL Structured programming Academic Press London and New York 1972.
3. HARXRY F. Graph theory Addison-Wesley Reading Mass. 1969. HARXRY F. Graph theory Addison-Wesley Reading Mass. 1969.
4. KRAUSE K. W. Ew AL. "Optimal software test planmng through automated network analysis " Proc 1973 IEEE Symposium on Computer Software Relzab~lzty New York April-May 1973. KRAUSE K. W. Ew AL. "Optimal software test planmng through automated network analysis " Proc 1973 IEEE Symposium on Computer Software Relzab~lzty New York April-May 1973.