Complex bibliographic research refers both to standard bibliographies, provided by the Central University Library "Carol I," as part of the process of searching and retrieving information requested by users, and to extensive research on a distinct subject (a detail from the biography of a personality, an aspect of the history of a company, a locality, etc.), which requires long searches, in several sources of information and involves the provision of the information itself and not (necessarily) the sources in which the search was performed.