A quality model of metamodeling systemsSgirka, Rünno; Eessaar, ErkiEmerging trends in computing, informatics, systems sciences, and engineering2013 / p. 543-555

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 versioning subsystem of metamodeling systemSgirka, RünnoInnovations and advances in computer, information, systems sciences, and engineering2013 / p. 305-317

A Versioning Subsystem of Metamodeling System [Electronic resource]Sgirka, RünnoCISSE 2011 International joint conferences2011 / [6 p. : ill] [CD-ROM]

An ontological analysis of metamodeling languagesEessaar, Erki; Sgirka, RünnoInformation systems development : reflections, challenges and new directions2013 / p. 381-392

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

A database-based and web-based meta-CASE systemEessaar, Erki; Sgirka, RünnoAdvanced techniques in computing sciences and software engineering2010 / p. 379-384 https://ui.adsabs.harvard.edu/abs/2010atcs.book..379E/abstract