Dave E. Eckhardt Alper K. Caglayan John C. Knight Larry D. Lee David F. McAllister Mladen A. Vouk John P. J. Kelly An Experimental Evaluation of Software Redundancy as a Strategy For Improving Reliability. 692-702 http://doi.ieeecomputersociety.org/10.1109/32.83905 1991 17 IEEE Trans. Software Eng. 7 db/journals/tse/tse17.html#EckhardtCKLMVK91