• 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
• 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 https://doi.org/10.1007/978-3-319-06773-5_8 https://www.scopus.com/sourceid/19700186822 https://www.scopus.com/record/display.uri?eid=2-s2.0-84921881697&origin=inward&txGid=7265302fc3b7aa4f493863b75ba34ae1