Ryoji Nakaoka
- (1986): Division of City Planning Department of Developmental Engineering Kitami Institute of Technology. In: 土木学会論文集 (Doboku Gakkai rombunshū), v. 1986, n. 371 (July 1986).
- (1995): The Impact of Improvement of Shinkansen from Relative Time Distance. In: Historical Studies in Civil Engineering, v. 15 ( 1995).
- (1993): A Study of Objective Classification for Historical Study in Civil Engineering. In: Historical Studies in Civil Engineering, v. 13 ( 1993).
- (1992): A Historical Study on the Time-Distance Map of Hokkaido Island. In: Historical Studies in Civil Engineering, v. 12 ( 1992).
- (1990): Creation and Application of Chronological Tables for the History of Civil Engineering with Relational Database. In: Historical Studies in Civil Engineering, v. 10 ( 1990).
- (1991): Honor of Civil Engineers. In: Historical Studies in Civil Engineering, v. 11 ( 1991).
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