1. The Design and Analysis of Computer Algorithms;Aho,1974
2. An algebraic approach to problem solution and problem semantics;Bertoni,1977
3. The algebraic theory of context-free languages;Chomsky,1963
4. Automatic solution of a certain class of combinatorial problems;Cohen;Inf. Proc. Letters,1977
5. Asymptotic Methods in Analysis;De Bruijn,1958