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Wood, Derick; Yu, Sheng . (1998). [Lecture Notes in Computer Science] Automata Implementation Volume 1436 || Multi-tape automata for speech and language systems: A prolog implementation. , 10.1007/BFb0031375(Chapter 8), 87–103. doi:10.1007/BFb0031383 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research