1. Amir, A.: Theoretical issues of searching aerial photographs: a bird’s eye view. In: Balík, M., Holub, J., Šimánek, M. (eds.) Proceedings of the Prague Stringology Conference 2004, Czech Technical University in Prague, Czech Republic, pp. 1–23 (2004)
2. Crochemore, M., Hancart, C.: Automata for matching patterns. In: Rozenberg, G., Salomaa, A. (eds.) Handbook of Formal Languages, pp. 399–462. Springer, Heidelberg (1997)
3. Lecture Notes in Computer Science;B. Melichar,1995
4. Melichar, B., Holub, J.: 6D classification of pattern matching problems. In: Holub, J. (ed.) Proceedings of the Prague Stringology Club Workshop 1997, Czech Technical University in Prague, Czech Republic, pp. 24–32 (1997)
5. Giammarresi, D., Restivo, A.: Two-dimensional languages. In: Handbook of Formal Languages, vol. III (Beyond Words), pp. 216–267. Springer, Heidelberg (1997)