A collaborative web-based and database-based meta-CASE environmentSgirka, RünnoDatabases and Information Systems : Doctoral Consortium : Riga, July 4, 20102010 / p. 31-42 : ill https://www.bjmc.lu.lv/fileadmin/user_upload/lu_portal/projekti/bjmc/Contents/757_3.pdf

Extended principle of orthogonal database designEessaar, ErkiProceedings of the 5th WSEAS International Conference on Artificial Intelligence, Knowledge Engineering and Data Bases : Madrid, Spain, February 15-17, 20062006 / p. 360-365 https://www.researchgate.net/publication/255599595_Extended_Principle_of_Orthogonal_Database_Design

Object-oriented database systems : persistence : master's thesisAstrova, IrinaA & A1998 / 4, lk. 36-38

On integration of object-oriented applications with relational databasesAstrova, Irina2003 http://www.ester.ee/record=b1833107*est

On schema transformation of relational database into object-oriented databaseAstrova, IrinaProceedings of the 4th International Workshop on Computer Science and Information Technologies, Patras, Greece2002 / [4] p

Personaalarvutite andmebaasisüsteemide võrdlev ülevaade : objektorienteeritud andmebaasisüsteem DataFlex 3.01991 https://www.ester.ee/record=b1062633*est

Preserving semantics of the whole-part relationships in the object-relational databasesEessaar, Erki15th International Conference on Information Systems Development : Budapest, Hungary, 31 August - 2 September 20062006 / ? p https://link.springer.com/chapter/10.1007/978-0-387-70802-7_1

Preserving semantics of the whole-part relationships in the object-relational databasesEessaar, ErkiAdvances in Information Systems development. New Methods and practice for the Networked Society. 22007 / p. 1-11

Whole-part relationships in the object-relational databasesEessaar, ErkiProceedings of the 10th WSEAS International Conference on Computers : Vouliagmeni, Athens, Greece, July 10-15, 20062006 / p. 1263-1268