The rates of Assignment of Thesaurus Terms in the Eric Information Retrieval System: an Analysis of Hierarchies and Levels. - Georgianna Henry; Virgil Diodato (J. Documentation, 1991)

The rates of assignment of narrower terms in the Thesaurus of ERIC Descriptors. - Virgil Diodato; Georgianna Henry (J. Inf. Sci., 1993)