1
by Hentschel, Gerd
Published 1986
Sagner

2
by Coșeriu, Eugenio
Published 1975
Fink

3
by Blümel, Wolfgang
Published 1982
Vandenhoeck & Ruprecht

4
by Hentschel, Gerd
Published 1993
Sagner

5
by Lehfeldt, Werner
Published 1993
Sagner