1. Geographic Information Systems: A Guide to the Technology;Antenucci,1991
2. Geographix Exploration System (GES), Version 7.1, Geographix Inc., Denver, Colo., 1993.
3. Prospects for Applying Automation/Robotization of Shield Method Work;Hashiba,1992
4. An Automatic Direction Control System for Shield Tunneling;Mikami,1991