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\cite{Symeonidis_2013} studies link prediction in biological and social network.  \cite{Robinson_2014} math teoretical  \subsection{Social Networks}  \cite{Campbell_2014} studies the following problems: community detection, relational learning, leadership role prediction. Co-occurences of entities is used to form a graph from text. A more refined approach is to extract relationships fromtext. A schema with entity types and attributes is described. A graphical query language is used to analyze the entity graph.