8ANDREAS BECKER B Sc. Investigation of Ball Point Pen Inks by Capillary Electrophoresis (CE) with UV/Vis Absorbance and Laser Induced Fluorescence Derection and Particle Induced X-Ray Emission (PIXE) [J].Journal of Forensic Sciences, 1999,44(4) :819 - 831.
9WILLIAMS D, MAZZELLA B S, AlTA KHANMYVITAL B S. A study to Investogate the Evidential Value of Blue Gel Pen Inks [J] . J Forensic Sci, 2003,48(2) :275 - 482.
10Henry T,Rhodes F.The oxidation of ferrous iron in iron gall ink[J].International Journal of Forensic Document Examiners,1998,4(3):62-65.