"Reference." . . "Intel·ligència artificial." . . "Informationsgenfinding." . . "Recherche documentaire automatisée." . . "bibliothèque Plexus (système expert) système d'information." . . "Information retrieval." . . "Rapporter." . . "Rapporter" . "Pc-ere." . . "Pc-ere" . "Storbritannien." . . "Storbritannien" . . . "Referral centers." . . "University of London." . . "Ekspertsystemer." . . "Ekspertsystemer" . "BL." . . "Sistemas expertos (Computación)" . . "Søgestrategier." . . "Søgestrategier" . "Online søgning." . . "Computer software." . . "British Library. Research and Development Department." . . "Informationssøgning." . . "Bibliotheekautomatisering." . . "Automatització de biblioteques." . . "PLEXUS." . . "PLEXUS" . "Centres d'orientation (Services d'information) Angleterre Londres Informatique." . . "Referral centers England London Data processing." . . "Serveis de referència (Biblioteques)" . . "PLEXUS (Sistema experto)" . . "Documentation, information science and librarianship." . . "Expertsystemen." . . "British Library." . . . . . . . . . . . . . . . . "Expert system for referral" . "Expert system for referral"@en . . . . . . . . . . . . . . . . . . . . . . . . . . . . "Describes the development and evaluation of PLEXUS, an expert system used to aid microcomputer retrieval of referral sources." . . . . . . . . . . . . . . .