Yavas, Mustafa, Aysun Guran, and Yeliz Ekinci. “Analysis of Public Agenda During Covid-19 Pandemics Based on Turkish and English Tweets Using Nonnegative Matrix Factorization and Hypothesis Testing”. Elektronika ir Elektrotechnika 28, no. 4 (August 24, 2022): 65-73. Accessed October 3, 2022. https://eejournal.ktu.lt/index.php/elt/article/view/31196.