S. Akiyama (University of Tsukuba), (13 joint papers)
M. Bennett (University of British Columbia), (4 joint papers)
Y. Bugeaud ( Université de Strasbourg), (5 joint papers)
A. Dujella (University of Zagreb), (6 joint papers)
J-H. Evertse (Leiden University), (29 joint papers)
C. Fuchs (Paris Lodron-University of Salzburg), (6 joint papers)
K. Liptai (Eszterházy Károly College), (3 joint papers)
F. Luca, (11 joint papers)
F. Mátyás (Eszterházy Károly College)
M. Mignotte (Université de Strasbourg), (10 joint papers)
M. Pohst (Technische Universität Berlin), (11 joint papers)
Cs. Rakaczki (University of Miskolc), (1 joint paper)
N. Saradha (Tata Institute of Fundamental Research), (5 joint papers)
A. Schinzel (Institute of Mathematics of the Polish Academy of Sciences), (4 joint papers)
T.N. Shorey (Tata Institute of Fundamental Research), (4 joint papers)
L. Szalay (University of West Hungary), (2 joint papers)
R. F. Tichy (Technische Universität Graz), (16 joint papers)
R. Tijdeman (Leiden University), (28 joint papers)
V. Ziegler (RICAM Linz), (7 joint papers)