G. Appa Rao, G. Srinivas, K. Venkata Rao, and P. Prasad Reddy, “Characteristic mining of Mathematical Formulas from Document - A Comparative Study on Sequence Matcher and Levenshtein Distance procedure”, Int. J. Comp. Sci. Eng., vol. 6, no. 4, pp. 400–404, Nov. 2025.