1. A clustering experiment: first step towards a computer-generated classification scheme;Price;Inform. Stor. Retr.,1968
2. Bibliographic coupling between scientific papers;Kessler;Am. Docum.,1963
3. Efficacy of citation indexing in reference retrieval;Huang;Libr. Res. Tech. Serv.,1968
4. The MIT technical information project;Kessler;Physics Today,1965