G. Zheng, X. S. Cheng, Y. Diao, and H. X. Wang. “Concept and Design Methodology of Redundancy in Braced Excavation and Case Histories”. Geotechnical Engineering Journal of the SEAGS & AGSSEA, vol. 42, no. 3, Sept. 2011, pp. 13-21, doi:10.14456/seagj.2011.11.