1. Relational completeness of data base sublanguages;Codd,1972
2. The Relational Model for Database Management: Version 2;Codd,1990
3. A new concept of sets to handle similarity in databases: the simsets;Pola,2013
4. Data Mining in Large Sets of Complex Data;Cordeiro,2013
5. Similarity search - the metric space approach;Zezula,2006