1. L. Kanal: Patterns in pattern recognition 1968–1974. IEEE Trans. IT-20, 697–722 (1974)
2. K.S. Fu: Syntactic Methods in Pattern Recognition (Academic, New York 1974)
3. R.O. Duda, P.E. Hart: Pattern Classification and Scene Analysis (Wiley, New York 1972)
4. K. Fukunaga: Introduction to Statistical Pattern Recognition (Academic, New York 1972)
5. W. Meisel: Computer-Oriented Approaches to Pattern Recognition (Academic, New York 1972)