https://www.chicagotribune.com/news/ct-xpm-2000-04-22-0004220030-story.html
https://books.google.com/books?hl=en&lr=&id=LAgUbT5pYXUC&oi=fnd&pg=PP1&dq=rudolf+dreikurs&ots=vZ7h5h4aiT&sig=hIHRdfmeLSLsF_ErzXg03JccH5c#v=onepage&q=rudolf%20dreikurs&f=false