1. A method, performed by computing functionality, for determining true mentions of a list of named entities in a collection of documents: receiving and storing a list of named entities, the named entities homogenously pertaining to a same subject matter domain; determining and storing a set of candidate mentions, each candidate mention corresponding to an occurrence of a string in a collection of documents that is associated with a named entity in the list; identifying true mentions within the set of candidate mentions, by leveraging homogeneity in the list, each true mention corresponding to a valid occurrence of a named entity in the collection of documents; and outputting the true mentions, said receiving, determining, identifying, and outputting being implemented by the computing functionality.