On a History and a Present Circumstances of Walking Aid for Persons with Visual Impairment in Japan. 5th International Conference on Civil Engineering Manila. 2002
土木学会
, 地盤工学会
, 交通工学研究会
, 国際土質基礎工学会(International Society for Soil Mechanics and Foundation Engineering)
, 国際ジオテキスタイル学会(International Geotextile Society)