@inproceedings{chen1978n,
  author={Chen, L. and Avizienis, A.},
  title={N-version programming: A fault-tolerance approach to reliability of software operation},
  booktitle={Proc. 8th IEEE Int. Symp. on Fault-Tolerant Computing (FTCS-8)},
  year={1978},
  pages={3--9}
}