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"Sigma system: Concepts and structure."
Noboru Akima et al. (1992)
- Noboru Akima, Shuji Nakata, Akiyoshi Nishijima, Tetsuya Kubo, Yasuo Konishi:
Sigma system: Concepts and structure. Future Gener. Comput. Syst. 7(2-3): 293-302 (1992)
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