1. A method executed by a processor of a computing device, the method comprising: generating a graphical summary of a research document for presentment on a display of a computing device in response to receipt of user input that identifies the research document, the research document having a publication date assigned thereto that indicates a date upon which the research document was published, the graphical summary of the research document is based upon content from other research documents, the other research documents include citations to the research document, the other research documents having publication dates that are subsequent to the publication date of the research document, the graphical summary of the research document comprises: a node that is representative of the research document; and portions of sentences in the other research documents that include the citations to the research document; and presenting the graphical summary of the research document on the display of the computing device.