1. Interaction of Tunnel Lining and Ground;Ahmed,1991
2. Behaviour of a shallow tunnel in till;Branco,1981
3. Nonlinear analysis of stress and strain in soils;Duncan;Journal of the Soil Mechanics and Foundation Division, ASCE,1970
4. Simplified analysis for tunnel supports;Einstein,1979
5. Convergence-Confinement method in shallow tunnels;Eisenstein,1985