Aiouni, Rym, Anis Bey, and Tahar Bensebaa. “An Automated Assessment Tool of Flowchart Programs in Introductory Programming Course Using Graph Matching”. Journal of e-Learning and Knowledge Society 12, no. 2 (May 21, 2016). Accessed September 27, 2020. https://www.je-lks.org/ojs/index.php/Je-LKS_EN/article/view/1138.