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4) Ancellotti, S. et al.:Rotary draw bending of rectangular tubes using a novel parallelepiped elastic mandrel, ibid., First online,(2015),1-15.
5) Zhang, H.L. et al.:Deformation behaviors of double-ridged rectangular H96 tube in rotary draw bending under different mandrel types, ibid., 82(2015),1569-1580.