3
by Brabec, Karel
Published 1975
Book
4
Published 1994
Book
7
9
by Czafik, Jozef, Virsík, Anton
Published 1980
Book
10
by Bonev, Vladimir
Published 1973
Book
16
by Christozov, Nikolaj, 1931-
Published 1982
Book
17
by Kerezov, Stamo.
Published 1976
Book
18
by Szuťányi, Ladislav
Published 2000
Thesis Manuscript
19
by Klímová, Hana
Published 1987
Thesis Manuscript
20
Book