<strong>Christopher, B.R., Gill, S.A., Giroud, J.P., Juran, I. Scholsser, F., Mitchell, J.K. and Dunnicliff, J., (1990b).</strong> <em>Reinforced Soil Structures, Volume II. Summary of Research and Systems Information</em>, Federal Highway Administration, Washington DC, Report No. FHWA-RD--89-043, Nov 1989, 158p.