1. sAccessNet. http://www.sciaccess.net/en/. Accessed 31 Mar 2022
2. Accessible Books Consortium. http://www.accessiblebooksconsortium.org/portal/en/. Accessed 31 Mar 2022
3. Lecture Notes in Computer Science;M Suzuki,2016
4. Nakamura, S., Kohase, K., Fujiyoshi, A.: Extracting precise coordinate information of components from E-Born PDF Files. In: Proceedings of the 4th International Workshop on “Digitization and E-Inclusion in Mathematics and Science 2021" (DEIMS2021), Nihon University, online, pp. 15–18 (2021)
5. DAISY Consortium. http://www.daisy.org/. Accessed 31 Mar 2022