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Roberta Petry Gorziza; Carina Maria Bello de Carvalho; Marina González; Rafael Scorsatto Ortiz; Gilson Augusto Helfer; Marco Flores Ferrão; Renata Pereira Limberger. Blue Ballpoint Pen Inks Differentiation Using Multivariate Image Analysis of Digital Images Captured With PhotoMetrix PRO®. BJFS 2020, 9, 331-355.