By TÜNDE KOVÁCS (Debrecen), KÁLMÁN LIPTAI (Eger) and PÉTER OLAJOS (Miskolc)
Dedicated to Professors K. Győry and A. Sárközy on their 70th birthdays
and Professors A. Pethő and J. Pintz on their 60th birthdays
ATTILA BÉRCZES, KÁLMÁN LIPTAI, AND ISTVN PINK
AKRUR BEHERA, KÁLMÁN LIPTAI, GOPAL KRISHNA PANDA, AND LÁSZLÓ SZALAY