Katona O.H. Gyula 80.

Füredi Zoltán (Rényi Intézet):  "Extremal combinatorics, results concerning Gyula Katona’s achievements"

Alexandr Kostochka (University of Illinois at Urbana-Champaign): “Neighborhoods of vertex subsets of n-cube"

Ervin Győri (Rényi Intézet): "The never ending tale of the Katona-Tarjan conjecture"