1. Kondoh, Y. et al. (1993): The acoustic environmental awareness of residents in high-rise apartment houses by the free response method, Proceedings of the Japan Society of Civil Engineers, 458, 111–120 (in Japanese).
2. Miyamoto, S. and Nakayama, K. (1980): A hierarchical representation of citation relationship, IEEE Trans., Systems Man and Cybern., SMC-10, 899–903.
3. Miyamoto, S. (1984): Development of a Computer Program Package for Bibliometrics, Report of a research supported by the Grant in Aid for Fundamental Scientific Research of the Educational Ministry in fiscal 1983, (in Japanese).
4. Miyamoto, S. et al. (1990): Methods of digraph representation and cluster analysis for analyzing free association, IEEE Trans., Systems Man and Cybem., Vol. 20, No. 3, 695–701.
5. Oi, K. et al. (1986): Analysis of cognitive structures of environment of the local residents through word association method, Ecological Modelling, 32, 29–41.