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Witold Tomaszewski
http://people.sissa.it/~dabrow/
http://kz.nysa.pl/
http://www.geogebra.org/cms/
http://www.wiris.com/content/view/18/58/lang,en/
http://www.oke.wroc.pl/
http://www.phy.duke.edu/history/DistinguishedFaculty/HerthaSponer/
http://www.korycki.com/