Jiménez, J. A., P. Acosta, G. Frommeyer, and O. A. Ruano. 1998. “Microstructure and Mechanical Properties of Two Tool Steels With Ultrahigh Boron Content”. Revista De Metalurgia 34 (Extra):300-304. https://doi.org/10.3989/revmetalm.1998.v34.iExtra.758.