Advances in Databases and Information Systems Associated Workshops and Doctoral Consortium of the 13th East European Conference, ADBIS 2009, Riga, Latvia, September 7-10, 2009. Revised Selected Papers - Grundspenkis, Janis; Kirikova, Marite; Manolopoulos, Yannis; Novickis, Leonids (Springer Berlin Heidelberg, 2010)