challenge: Where can an extensive bibliography of Theodor Bergmann's work be found?
  
  A. On the website of the Helle Panke organization
  B. In a journal article published by the University of Berlin
  C. In a book titled 'The Life and Works of Theodor Bergmann'
  D. In the brochure 'Die Tradition kritischer Solidarität von Luxemburg bis Gorbatschow, Pankower Vorträge, Heft 200'
  Answer: 