1
by Ibeh, Martin Joe
Published 2003
Schöningh

2
by Puhl, Monika
Published 2005
Fink

3
by Stavrou, Theofanis G.
Published 1998
Südosteuropa-Ges.

4
by Losev, Lev V.
Published 1984
Sagner

5
by Mladenova, Olga M.
Published 2004
Sagner

6
by Gumpel, Werner
Published 1986
Selbstverl. d. Südosteuropa-Ges.

8
by Backes, Uwe
Published 2008
Vandenhoeck & Ruprecht