• A semiotic approach to quality in specifications of software measuresEessaar, ErkiEnterprise information systems : 10th International Conference, ICEIS 2008 : Barcelona, Spain, June 12-16, 2008 : revised selected papers2009 / p. 73-86 : ill https://link.springer.com/chapter/10.1007/978-3-642-00670-8_6
• A SQL database based meta-CASE system and its query subsystemEessaar, Erki; Sgirka, RünnoInnovations in computing sciences and software engineering2010 / p. 57-62 https://link.springer.com/chapter/10.1007/978-90-481-9112-3_10
• A UML profile for developing databases that conform to the third ManifestoEessaar, ErkiInnovations in computing sciences and software engineering2010 / p. 69-74 https://ui.adsabs.harvard.edu/abs/2010iics.book...69E/abstract
• Andmebaaside projekteerimineEessaar, Erki2008 http://www.ester.ee/record=b2431333*est
• 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
• Evaluation of different designs to represent missing information in SQL databasesEessaar, Erki; Saal, ElariInnovations and advances in computer, information, systems sciences, and engineering2013 / p. 173-187 https://doi.org/10.1007/978-1-4614-3535-8_14 https://www.scopus.com/sourceid/19700186822 https://www.scopus.com/sourceid/19700186822
• Evaluation of Different Designs to Represent Missing Information in SQL Databases [Electronic resource]Eessaar, Erki; Saal, ElariCISSE 2011 International joint conferences2011 / [6 p. : ill] [CD-ROM] https://link.springer.com/chapter/10.1007/978-1-4614-3535-8_14
• Extending UML profiles to model integrity constraints in SQL databasesEessaar, Erki; Aaberg, ErkoProceedings of the 21th [i. e. 21st] European-Japanese Conference on Information Modelling and Knowledge Bases : EJC2011 : Tallinn, Estonia, June 06-10, 2011. Vol. 12011 / p. 47-65 : ill https://www.researchgate.net/publication/260291830_Extending_UML_Profiles_to_Model_Integrity_Constraints_in_SQL_Databases
• Extending UML profiles to model integrity constraints in SQL databasesEessaar, Erki; Aaberg, ErkoInformation modelling and knowledge bases XXIII2012 / p. 39-58 : ill https://www.researchgate.net/publication/260291830_Extending_UML_Profiles_to_Model_Integrity_Constraints_in_SQL_Databases
• Mapping of SQL relational schemata to OWL ontologiesAstrova, Irina; Kalja, AhtoProceedings of the 6th WSEAS International Conference on Applied Informatics and Communications : Crete Island, Greece, August 18-20, 20062006 / p. 375-380 https://dl.acm.org/doi/abs/10.5555/1366421.1366487
• A novel approach to mapping SQL relational schemata to OWL ontologiesAstrova, Irina; Kalja, AhtoWSEAS transactions on information science and applications2006 / 3, p. 2215-2222
• On query-based search of possible design flaws of SQL databasesEessaar, ErkiInnovations and advances in computing, informatics, systems sciences, networking and engineering2015 / p. 53-60 http://dx.doi.org/10.1007/978-3-319-06773-5_8
• On the design of base tables in the SQL databases of some existing softwareEessaar, ErkiSoftware engineering perspectives in systems : proceedings of 11th Computer Science On-line Conference 2022, Vol. 12022 / p. 309-324 https://doi.org/10.1007/978-3-031-09070-7_26 https://www.scopus.com/sourceid/21100901469 https://www.scopus.com/record/display.uri?eid=2-s2.0-85135054325&origin=inward&txGid=4b807c344f0b745014db390351354b6f https://www.webofscience.com/wos/woscc/full-record/WOS:000893645700026
• On the naming of database objects in the SQL databases of some existing softwareEessaar, ErkiSoftware engineering research in system science : proceedings of 12th Computer Science On-line Conference 20232023 / p. 534 - 550 https://doi.org/10.1007/978-3-031-35311-6_51 https://www.scopus.com/sourceid/21100901469 https://www.scopus.com/record/display.uri?eid=2-s2.0-85171387374&origin=inward&txGid=0281af6f4868ed40c3743bc80d8b163f
• Performance benchmarking of NewSQL databases with Yahoo cloud serving benchmarkAstrova, Irina; Koschel, Arne; Wellermann, Nils; Klostermeyer, PhilipProceedings of the Future Technologies Conference (FTC) 2020 ; vol. 22021 / p. 271-281 https://doi.org/10.1007/978-3-030-63089-8_17 https://www.scopus.com/sourceid/5100152904 https://www.scopus.com/record/display.uri?eid=2-s2.0-85096468322&origin=inward&txGid=1580fed47a1a5d17d1a129ec7eebfaf2
• Päringukeel SQL : ülevaadeLaiatarbe tarkvarapaketid personaalarvutitele. Andmebaasisüsteemid1989 / lk. 186-195 : ill https://www.ester.ee/record=b1507395*est
• SQLLeis, PaulArvutustehnika ja Andmetöötlus1990 / 6, lk. 20-28
• SQL or third manifesto compliant object-relational database management systems as the platforms for maintainaning the whole-part relationships in a databaseEessaar, ErkiWSEAS transactions on computers2006 / 10, p. 2440-2447
• Storing OWL ontologies in SQL relational databasesAstrova, Irina; Korda, Nahum; Kalja, AhtoInternational journal of electrical, computer, and systems engineering2007 / 4, p. 242-247 https://zenodo.org/records/1071690
• Storing OWL ontologies in SQL relational databasesAstrova, Irina; Korda, Nahum; Kalja, AhtoProceedings of World Academy of Science, Engineering and Technology (WASET) : International Conference on Computer, Electrical, and Systems Science, and Engineering (CESSE) : Berlin, Germany, 20072007 / p. 169-172 https://www.researchgate.net/publication/242756222_Storing_OWL_ontologies_in_SQL_relational_databases
• The usage of declarative integrity constraints in the SQL databases of some existing softwareEessaar, ErkiSoftware Engineering and Algorithms : Proceedings of 10th Computer Science On-line Conference 2021, Vol. 12021 / p. 375–390 https://doi.org/10.1007/978-3-030-77442-4_33 https://www.scopus.com/sourceid/21100901469 https://www.scopus.com/record/display.uri?eid=2-s2.0-85113391427&origin=inward&txGid=e89621317aebbd3e57596ea89ce4537c
• Using metamodeling in order to evaluate datamodelsEessaar, ErkiProceedings of the 6th WSEAS International conference on artificial Intelligence, Knowledge Engineering and Data Bases : Corfu Island, Greece, February 16-19, 20072007 / p. 181-186 https://www.researchgate.net/publication/254470284_Using_Metamodeling_in_order_to_Evaluate_Data_Models
• Using SQL queries to evaluate the design of SQL databasesEessaar, Erki; Voronova, JaninaNew trends in networking, computing, e-learning, systems sciences, and engineering2015 / p. 179-186 http://dx.doi.org/10.1007/978-3-319-06764-3_23