1. Lecture Notes in Artificial Intelligence;S. Autexier,2006
2. Bartle, R.G., Sherbert, D.R.: Introduction to Real Analysis. John Wiley and Sons, New York (1982)
3. Baur, J.: Syntax und semantik mathematischer texte. Diploma thesis, Saarland University, Saarbrücken, Germany (1999)
4. An EATCS Series;Y. Bertot,2004
5. Lecture Notes in Artificial Intelligence;E.C. Brown,2006