1. Ahlswede, R., Wegener, I. (1979). Suchprobleme, Teubner B.G., Stuttgart.
2. Albrecht M., Altus M., Buchholz B., Düsterhöft A., Schewe K.-D., Thalheim B. (1994), Die intelligente Tool Box zum Datenbankentwurf RAD. Datenbank-Rundbrief, 13, FG 2.5. der GI, Kassel.
3. Andreev, A. (1982), Tests and pattern recognition. PhD thesis, Moscov State University, 1982.
4. Armstrong, W.W. (1974). Depending structures of database relationships. Information Processing-74, North Holland, Amsterdam, 580–583.
5. Beeri C., Dowd M., Fagin R., Statman R. (1984), On the structure of Armstrong relations for functional dependencies. Journal of ACM, Vol.31, No.1, 30–46.