1
2
Published: 1988, [ersch., 1989]
3
4
5
Published: 2012-
6
“...Plovdivski universitet "Paisij Chilendarski"...”
7
“...Plovdivski universitet "Paisij Chilendarski"...”
8
“...Plovdivski universitet "Paisij Chilendarski"...”
9
Published: anfangs;, 1984-1986
10
Published: 1967-1971