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Aho Alfred V., 1979, 6TH P ACM S PRINC PR, P110
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AHO AV, 1977, 18TH P IEEE S F COMP
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ARMSTRONG WW, 1974, P IFIP C, P580
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BANCILHON F, 1978, 7TH P S MATH F COMP
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BEERI C, 1977 P SIGMOD C, P47
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CASANOVA MA, 1979, 6TH P ACM S PRINC PR, P101
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Chandra A. K., 1980, 21st Annual Symposium on Foundations of Computer Science, P333, DOI 10.1109/SFCS.1980.41
[10]
Chandra A. K., 1978, 19th Annual Symposium on Foundations of Computer Science, P127, DOI 10.1109/SFCS.1978.10