Rosa, Daniel, Filipe R. Cordeiro, Ruan Carvalho, Everton Souza, Sergio Chevtchenko, Luiz Rodrigues, Marcelo Marinho, Thales Vieira, and Valmir Macario. " Recognizing Handwritten Mathematical Expressions of Vertical Addition and Subtraction." Anais da XXXVI Conference on Graphics, Patterns and Images, Rio Grande/RS, 2023. SBC, 2023, pp.73-78.