2
by Ritter, Werner H.
Published 2007
Vandenhoeck & Ruprecht

3
by Ritter, Werner H.
Published 1997
Vandenhoeck & Ruprecht

4
by Ritter, Werner H.
Published 2000
Vandenhoeck und Ruprecht

5
by Ritter, Werner H.
Published 2003
Vandenhoeck & Ruprecht