Keiji Kojima
- Soft Rock-fundamentals and Examples For Investigation, Design and Construction Works. 岩盤力学委員会第四分科会“軟岩”の活動報告. In: 土木学会論文集 (Doboku Gakkai rombunshū), v. 1984, n. 346 (Juni 1984). (1984):
- Underground space use in Japan— Recent and near-future developments. In: Tunnelling and Underground Space Technology, v. 5, n. 1-2 (Januar 1990). (1990):