1. http://dcis.uohyd.ernet.in/~pavanp/mathocr/PrintedMEs.zip
2. flex++(1):fast lexical analyzer generator-Linux man page,
http://linux.die.net/man/1/flex++
3. Awal, A.-M., Mouchere, H., Viard-Gaudin, C.: Towards handwritten mathematical expression recognition. In: ICDAR 2009, pp. 1046–1050. IEEE Computer Society, Washington, DC (2009)
4. Buchanan, B.G., Shortliffe, E.H.: Rule Based Expert Systems: The Mycin Experiments of the Stanford Heuristic Programming Project. Addison-Wesley (1984)
5. Chan, K.-F., Yeung, D.-Y.: Mathematical expression recognition: a survey. IJDAR 3, 3–15 (2000)