1. Ministry of Health and Welfare. http://www.nhi.gov.tw/english/index.aspx?menu=8&menu_id=30&webdata_id=0&WD_ID=30
2. Govindaraju, V., Srihari, S.N.: Separating Handwritten Text from Interfering Strokes. From Pixels to Features III: Frontiers in Handwriting Recognition. Elsevier Science Publisher, Amsterdam (1992). pp. 17–28
3. Liang, S., Ahmadi, M., Shridhar, M.: Segmentation of interference marks using morphological approach. In: Proceedings of the Third ICDAR, pp. 1042–1046 (1995)
4. Yu, B., Jain, A.K.: A generic system for form dropout. IEEE Trans. PAMI 18(11), 1127–1134 (1996)
5. Huang, W., Rong, G., Bian, Z.: Strokes removing from static handwriting. In: Proceedings of the Third ICDAR, pp. 861–864 (1995)