1. The Design and Analysis of Computer Algorithms;Aho,1974
2. Recognizable formal power series on trees;Berstel;Theoret. Comput. Sci.,1982
3. A fast string searching algorithm;Boyer;Comm. ACM,1977
4. Asymptotic Methods in Analysis;de Bruijn,1961
5. The average height of planted plane trees;de Bruijn,1972