Their 1977 textbook Principles of Compiler Design had a green dragon on the front cover and became known as "the green dragon book".
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Steve Johnson used the bottom-up LALR parsing algorithms to create the syntax-analyzer generator yacc, and Michael E. Lesk and Eric Schmidt used Aho's regular-expression pattern-matching algorithms to create the lexical-analyzer generator lex.
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In 1974, Aho, John Hopcroft, and Ullman wrote the Design and Analysis of Computer Algorithms, codifying some of their early research on algorithms.
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At Bell Labs Aho worked closely with Steve Johnson and Jeffrey Ullman to develop efficient algorithms for analyzing and translating programming languages.
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