21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
4th PES Summer University 1999
Date 1999
verslag
36
Nürnberg, Germany, November 1996
Date 1996
verslag
37
38
30 March - 6 April 1997. Debrecen, Hungary
Date 1997
verslag
39
40
O.W. Jodlow - Almatur; Huta Szklana, Kielce, Poland. 24 October 1 November 1998
Date 1998
verslag