Publ. Math. Debrecen, 71 (2007), no. 1-2, 165-171 Mathematics Subject Classification : 11A25, 11N37

Address for correspondence: Xatzipsalti Maria, 1 Zafeiriou Str., 171 22 Nea Smyrni, Athens, Greece, Tel.: +3

[This corrects the article on p. 171 in vol. 33, PMID: 28747984.].

[This corrects the article on p. 171 in vol. 6, PMID: 25852720.].

s: Plenary Addresses .............................................................................................. 18 Short Talks ......................................................................................................... 20 Posters ................................................................................................................ 42 Author Index .......................