More sets, graphs and numbers [Electronic resource] : a salute to vera sós and andrás hajnal / ed. E. Győri [et al.]. - Electronic text data. - Berlin ; Heidelberg : Springer, 2006. - (Bolyai society mathematical studies, ISSN 1217-4696 ; 15). - ISBN 978-3-540-32439-3 : Б. ц.