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[Basili and Hutchens 1983] Basili, Victor R., and David H. Hutchens. 1983. An Empirical Study of a Syntactic Complexity Family. IEEE Transactions on Software Engineering SE-9(6): 664–672.
[Basili and Perricone 1984] Basili, Victor R., and Barry T. Perricone. 1984. Software Errors and Complexity: An Empirical Investigation. Communications of the ACM 27(1): 42–52.