Warren, C., & Tromans, I. Geotechnical Aspects of the Strood and Higham Railway Tunnel Relining and Refurbishment. In Proc. of the 10th Congress of the International Association for Engineering Geology and the Environment-Engineering Geology for Tomorrow's Cities. Nottingham, United Kingdom (2006).

Warren, C., & Tromans, I. Geotechnical Aspects of the Strood and Higham Railway Tunnel Relining and Refurbishment. In Proc. of the 10th Congress of the International Association for Engineering Geology and the Environment-Engineering Geology for Tomorrow's Cities. Nottingham, United Kingdom (2006).