1. A construction of information retrieval system as a problem solving machine;Maeda,1977
2. An analysis of hierarchical semantic structures in the documents;Momouchi,1977
3. Information structure of scientific documents—I;Maeda,1979
4. PRECIS: A Manual of Concept Analysis and Subject Indexing;Austin,1974
5. Automatic indexing;Jones;J. Docum.,1974