The use of small punch test to evaluate the ductile to brittle transition temperature of structural steels

M.A. Contreras, C. Rodriguez, F.J. Belzunce, C. Betegon
Fatigue and Fracture of Eng. Materials and structures, vol 31, pp 727-737
http://dx.doi.org/10.1111/j.1460-2695.2008.01259.x