Huang, L. B., V. Balakrishnan, and R. G. Raj. “Improving the Relevancy of Document Search Using the Multi-Term Adjacency Keyword-Order Model”. Malaysian Journal of Computer Science, vol. 25, no. 1, Mar. 2012, pp. 1-10, https://mjcs.um.edu.my/index.php/MJCS/article/view/6584.