International bibliographic review on costs and modelling in information retrieval : report on completion of data collection, assessment of the efficiency of searching, and on means of indexing this information / P.S. Davison ... [et al.]. (British Library research paper ; 37)
International bibliographic review on costs and modelling in information retrieval : report on completion of data collection, assessment of the efficiency of searching, and on means of indexing this information / P.S. Davison ... [et al.].