“…Imprinted ridges of various cross-sections, as well as shapes such as pillars and sprockets that remain attached to a BMG surface, have been described, notably by Saotome et al (2001aSaotome et al ( ,b,c, 2002Saotome et al ( , 2004Saotome et al ( , 2007 but also by others Chu et al (2007), Macht et al (2006), Na et al (2007) and Pryds (2004).…”