title: SPIRS, WinSPIRS, and OVID: a question of free-text versus thesaurus retrieval?
authors.forename: E
authors.initials: E
authors.lastname: Fremer
authors.forename: B
authors.initials: B
authors.lastname: Larsson
mesh_terms: D016251:CD-ROM; D016247:Information Storage and Retrieval; D016239:MEDLINE; D015203:Reproducibility of Results; D014481:United States; D018875:Vocabulary, Controlled