Grossschmidt, Gunnar : [biographical data]
Who's Who in the world 2000 : Millennium edition. 17th edition
1999
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p. 816
[Krunks, Malle]
Who's Who in the World 2009. 26th Edition
2008
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p. 1467
Velmre, Enn : engineering educator
Velmre, Enn
Who's Who In The World 2007. 24th Edition
2006
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p. 2636
https://archive.org/details/whoswhoinworld200000marq_24ed/page/n5/mode/2up
Who's who in science and engineering 2005-2006
2004
https://www.ester.ee/record=b2012735*est