1. Elements of Software Science;Halstead,1977
2. Definition and design of a tool for program control structure measures;Howatt,1985
3. Software structure metrics based on information flow;Henry;IEEE Trans. Software Engineering,1981
4. A measure of control flow complexity in program text;Woodward;IEEE Trans. Software Engineering,1979
5. Experimental evaluation of the data dependency graph for use in measuring software clarity;Bieman,1985