1. A method, comprising: receiving input from a user pertaining to a first research document, wherein the research document has at least one author and includes citations to other research documents; executing a search over contents of a data repository responsive to receiving the input from the user, wherein the data repository comprises data pertaining to a plurality of research documents including the first research document; and based at least in part upon executing the search, causing a co-citation graph to be presented on a display screen of a computing device, wherein the co-citation graph comprises a first node that is representative of the first research document, a second node that is representative of a second research document, a third node that is representative of a third research document that cites both the first research document and the second research document, and text included in at least one sentence in the third research document that includes a citation to at least one of the first research document or the second research document.