Hierarchy Ontology Hierarchical clustering Hierarchical structure comparison Dendrogram Dominance hierarchy Pecking order Emergence of hierarchy References By Gergely Palla Ontologies and tag-statistics Extracting Tag Hierarchies Random walk hierarchy measure: What is more hierarchical, a chain, a tree or a star? Time evolution of the hierarchical networks between PubMed MeSH terms Spatial networks Emergence of hierarchy in cost-driven growth of spatial networks