"Gruendungsurkunde"(PDF) (in German). Interogo Foundations. 29 March 1989. Archived from the original(PDF) on 9 October 2012. Retrieved 28 January 2011.
"Gruendungsurkunde"(PDF) (in German). Interogo Foundations. 29 March 1989. Archived from the original(PDF) on 9 October 2012. Retrieved 28 January 2011.