2 Titles for Schmidt, Helmut

• 
   The document is publicly available on the WWW

  Otis (2005) Band 13 Sonderheft

  Potsdam : ABBO, 1.1993 -, 1993-
• 
   The document is publicly available on the WWW

  Otis (2008) Band 16

  Potsdam : ABBO, 1.1993 -, 1993-