1. Allen T. and Bathurst R. (2001a). “Application of the Ko-stiffness method to reinforced soil wall limit state design.” WA-RD 528.1 Washington State Department of Transportation Olympia Wash.
2. Allen T. and Bathurst R. (2001b). “Prediction of soil reinforcement loads in mechanically stabilized earth (MSE) walls.” WA-RD 522.1 Washington State Department of Transportation Olympia Wash.
3. Allen T. and Bathurst R. (2003). “Prediction of reinforcement loads in reinforced soil walls.” WA-RD-522.2 Revised Washington State Department of Transportation Olympia Wash.