Oñoro, J., R. Bermejo, A. Portolés, and R. Gamboa. “Modelling the Energy Absorbed During a Laser Beam Metal Melting Process”. Revista De Metalurgia, vol. 34, no. 5, Oct. 1998, pp. 421-7, doi:10.3989/revmetalm.1998.v34.i5.809.