Tojal, C., V. Amigó, and J. A. Calero. “Fabrication and Characterisation of Porous Ti and Ti6Al4V Produced by Sintering With Spacer”. Revista De Metalurgia, vol. 49, no. 1, Feb. 2013, pp. 20-30, doi:10.3989/revmetalm.1206.