1. A computer-implemented method, comprising: receiving document data indicating (i) a corpus of documents and (ii) references between documents within the corpus of documents; determining a network comprising (i) two or more nodes, wherein each node corresponds to a respective document in the corpus of documents, and (ii) at least one directed edge, wherein each directed edge connects two respective nodes, and wherein each directed edge corresponds to a reference between two documents in the corpus of documents; based on the directed edges of the network, determining a hierarchical partition of the documents, wherein the hierarchical partition defines a plurality of nested modules, and wherein each module in the plurality of nested modules is associated with one or more respective documents within the corpus of documents; and causing a graphical display to provide a visual indication of one or more of the plurality of nested modules.