Diep, Bui Khac, and Lam Huu Quang. “Calculation of Loading-Induced Tendon Slip in Beams Prestressed With External Tendons. Part I: Experiment”. <i>Vietnam Journal of Mechanics</i>, vol. 28, no. 3, Oct. 2006, pp. 165-7, doi:10.15625/0866-7136/28/3/5576.