1. Partnering — a Concept for Success;AGC,1991
2. North American Tunnelling '98 Takes on Issues for the Future;Ahrens;Tunneling and Underground Space Technology, (International Tunneling Association),1998
3. World-wide research points to the need for new approaches to control tunnelling risks;Anderson,1997
4. Minimising underground construction risks needs maximum engineering effort;Anderson,1998
5. Reducing risks and achieving successfocusing on the one issue that really matters;Anderson,1999