1. A computer-implemented method to monitor documents in a managed research domain to determine whether changes in cited content undermine semantic conformity with citing content, the computer-implemented method comprising: receiving a primary research document to store in a repository provided by the managed research domain; extracting one or more citations from the primary research document, wherein each extracted citation references a respective one of one or more cited documents; for each cited document, evaluating content of the cited document using a set of annotators to derive a respective collection of cited assertions from the content of the cited document, wherein the set of annotators includes at least three of: (i) a normalization annotator normalizing the terms in the primary research document and the terms in the one or more cited documents to predefined terms used in a common ontology specific to the managed research domain; (ii) a sentence annotator identifying each sentence in a given document selected from: the primary research document and the one or more cited documents; (iii) a parts-of-speech annotator tagging words in each identified sentence and according to parts-of-speech; (iv) a support annotator identifying references to any documents and further identifying which assertions are supported by the identified references; and (v) a disambiguation annotator evaluating and reconciling results of at least two of the set of annotators; evaluating content of the primary research document using the set of annotators to derive a collection of citing assertions from the content of the primary research document; storing the primary research document, each collection of cited assertions, and the collection of citing assertions in the repository provided by the managed research domain; monitoring for changes to cited content in each cited document, including changes to cited content a first cited document; for each monitored change to the cited content in the first cited document, determining, by operation of one or more computer processors and based on the derived collections of cited assertions and citing assertions, whether the respective monitored change undermines semantic conformity of the cited content in the first cited document with corresponding, citing content in the primary research document; upon determining that a first of the monitored changes to the cited content in the first cited document undermines semantic conformity with the citing content, designating the citing content as potentially lacking semantic conformity with the changed, cited content, by annotating the citing content in the primary research document without annotating the changed, cited content in the first cited document; in response to the designation, generating an alert identifying the citing content and indicating that semantic conformity is undermined; outputting the alert to an author of the primary research document in order to prompt the author to reapprove at least the citing content in the primary research document in light of the changed, cited content in the first cited document; and removing the designation from the primary research document after receiving, from the author, an indication of reapproval of the citing content in the primary research document.