1
by Lehfeldt, Werner
Published 1993
Sagner

2
by Blümel, Wolfgang
Published 1982
Vandenhoeck & Ruprecht

3
by Hentschel, Gerd
Published 1993
Sagner

4
by Coșeriu, Eugenio
Published 1975
Fink

5
by Gorup, Radmila J.
Published 1987
Sagner

6
by Hentschel, Gerd
Published 1986
Sagner