Romero, J. L., Linaza, M. A., San Martín, J. I., Rodríguez-Ibabe, J. M., & Urcola, J. J. (1996). Influence of the microstructure on the fracture toughness of forging microalloyed steels. Revista De Metalurgia, 32(3), 167–179. https://doi.org/10.3989/revmetalm.1996.v32.i3.912