Akira Okuda
- (1997): The Construction and the Background of Five Stone-Masonry Bridges over the Kotsuki River. In: Historical Studies in Civil Engineering, v. 17 ( 1997).
- (1997): On the Development History of Arch Stone Bridges, and it's Engineer IWANAGA Sangoro, Chief of Stonemason, and ASO Tetsuya, Master Carpenter. In: Historical Studies in Civil Engineering, v. 17 ( 1997).
- (1997): The history of prevention of flooding of the Kotsuki river, the changes in the characterities of the catchment area and the five stone-masonry bridges. In: Historical Studies in Civil Engineering, v. 17 ( 1997).
- (1997): On Technical and Historical Discussions about the Five Stone-Masonry Arch Bridges over the Kotsuki River. In: Historical Studies in Civil Engineering, v. 17 ( 1997).
- (1997): Historical studies on the five stone-masonry bridges over the Kotsuki river. In: Historical Studies in Civil Engineering, v. 17 ( 1997).
- (1997): Harmonization between flood control works and cultural properties. In: Historical Studies in Civil Engineering, v. 17 ( 1997).
- (1997): The flood prevention measures of the Kotsuki river for a situation such as the heavy rainfall of August 1993 and the measures for the preservation of stone-masonry bridges. In: Historical Studies in Civil Engineering, v. 17 ( 1997).
- (1996): Configurational and Structural Features of Five Major Stone Masonry Bridges over the Kotsuki River in Kagoshima. In: Historical Studies in Civil Engineering, v. 16 ( 1996).
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