TY - JOUR AU - Katona, Gyula O.H. AU - Tichler, KrisztiƔn TI - An extremal problem on trees and database theory JO - Discrete mathematics & theoretical computer science PY - 2005 VL - DMTCS Proceedings vol. AE, European Conference on Combinatorics, Graph Theory and Applications (EuroComb '05) PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.46298/dmtcs.3461/ DO - 10.46298/dmtcs.3461 LA - en ID - DMTCS_2005_special_250_a70 ER -