5Aginsky,V.Determining the sequence of non-intersecting media on documents:ballpoint pen ink and laser toner entries,J.Am.Soc.Questioned Doc.Examiners,2005(1):1-4.
6Montani I,Mazzella W,Guichard M,Marquis R.Examination of heterogeneous crossing sequences between toner and rollerball pen strokes by digital microscopy and 3-D laser profilometry.J Forensic Sci,2012(4):997-1002.
7Jane Lewis.Forensic document examination:fundamentals and current trends[M].San Diego,US:Academic Press,2014:69-78.