Raghavendra Vijay Bhasker Vangara, Shiva Prasad Vangara, Kailashnathan Thirupathur, Bharath Tavidaboina, “A Hybrid Model for Summarizing Text Documents Using Text Rank Algorithm and Term Frequency”, IJAST, vol. 29, no. 04, pp. 3967 -, Jun. 2020.