Cooper, R., J. H. Silva, and R. E. Trevisan. “Influence of Preheating on API 5L-X80 Pipeline Joint Welding With Self Shielded Flux-Cored Wire”. Revista De Metalurgia, vol. 40, no. 4, Aug. 2004, pp. 280-7, doi:10.3989/revmetalm.2004.v40.i4.275.