H. Hassan, N. Ali, A. H. Zakaria, M. I. Awang, and A. R. Mamat, “Graph Theoretic Lattice Mining Based on Formal Concept Analysis (FCA) Theory for Text Mining”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 7, no. 4, pp. 1413–1418, Aug. 2017.