Research & Education JFS Articles AAFS Connect Conference Proceedings Reference Series Library International Educational Outreach Program Determination of Physicochemical Changes in Black Ballpoint Pen by HPLC Method Presenting section: Questioned Documents 2014 Gungor, Burak H., Istanbul TURKEY; Salkim Islek, Dilek, Istanbul TURKEY; Cengiz, Salih, Istanbul TURKEY View the paper Questioned Documents