truetrue This image is a derivative work of the following images: File:Heyrovsky_Jaroslav.jpg licensed with Cc-by-sa-3.0 2012-02-03T10:40:04Z Materialscientist
the following license: English German Gedenktafel für den Chemiker JaroslavHeyrovský author name string: Koffeeinist Wikimedia username: Koffeeinist URL: