Hsu, T. T. C. and Mo, Y. L. (1983). Softening of concrete in torsional members, Research
Report No. ST-TH-001-83, Department of Civil Engineering, University of Houston, Texas,
USA.Hsu, T. T. C. and Mo, Y. L. (1983). Softening of concrete in torsional members,
Research Report No. ST-TH-001-83, Department of Civil Engineering, University of Houston,
Texas, USA.