Ri Kim, Ju, Zhanfang Zhao, and Sung Kook Han. “Sparql Query Processing in Relational Databases”. International Journal of Engineering and Technology 7, no. 2.33 (June 8, 2018): 84–88. Accessed August 17, 2025. https://mail.sciencepubco.com/index.php/IJET/article/view/13860.