Lukmana, Indra, et al. “MULTI-DOCUMENT SUMMARIZATION BASED ON SENTENCE CLUSTERING IMPROVED USING TOPIC WORDS”. JUTI: Jurnal Ilmiah Teknologi Informasi, vol. 12, no. 2, July 2014, pp. 1-8, https://doi.org/10.12962/j24068535.v12i2.a317.