1
Published 1980
2
Published 1995
3
Published 1993
4
Published 1988
5
Published 1986
6
Published 1982
7
8
Published 1990
9
10
Published 1994
11
Published 1994
12
Published 1990
13
Published 1991
14
by Simai, Mihaly
Published 1995
15
Published 2002
16
17
18
Published 1991