• LineaaralgebraPuusemp, Peeter2000 https://www.ester.ee/record=b1421028*est
• LineaaralgebraPaal, Eugen2004 http://www.ester.ee/record=b1926837*est
• LineaaralgebraPuusemp, Peeter2008 http://www.ester.ee/record=b2416484*est