Gergely Palla, Gergely Tibély, Enys Mones, Péter Pollner & Tamás Vicsek Hierarchical networks of scientific journals
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doi:10.1057/palcomms.2015.16

G. Tibély, P. Pollner, T. Vicsek and G. Palla Extracting tag-hierarchies
PLoS ONE 8(12) e84133 (2013).
doi:10.1371/journal.pone.0084133

G. Tibély, P. Pollner, T. Vicsek and G. Palla, Ontologies and tag-statistics
New Journal of Physics 14 , 053009 (2012).
doi:10.1088/1367-2630/14/5/053009