Grossschmidt, Gunnar : [biographical data]Who's Who in the world 2000 : Millennium edition. 17th edition1999 / p. 816

[Krunks, Malle]Who's Who in the World 2009. 26th Edition2008 / p. 1467

Velmre, Enn : engineering educatorVelmre, EnnWho's Who In The World 2007. 24th Edition2006 / p. 2636 https://archive.org/details/whoswhoinworld200000marq_24ed/page/n5/mode/2up

Who's who in science and engineering 2005-20062004 https://www.ester.ee/record=b2012735*est