Author(s): Bishop, George E.; Hippler, Hans-Jürgen; Schwarz, Norbert; Strack, Fritz.- 1987. 21,14p.

Author(s): Schwarz, Norbert; Strack, Fritz.- 1988. 40p.

Author(s): Schwarz, Norbert; Strack, Fritz; Hippler, Hans-Jürgen; Bishop, George.- 1990. 20p.

Author(s): Schwarz, Norbert; Strack, Fritz; Müller, Gesine; Chassein, Brigitte.- 1987. 16,3p.

Author(s): Strack, Fritz; Martin, Leonhard L.; Schwarz, Norbert.- 1987. 33,3p.

Author(s): Bless, Herbert; Strack, Fritz; Schwarz, Norbert.- 1992. 33p.

Author(s): Schwarz, Norbert; Bishop, George F.; Hippler, Hans-J.; Strack, Fritz.- 1989. 45p.