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APA Citation
Zyarah, A. A. A., Salman, Z. I., Hashim Al Hakeem, M. B., Al-Mothafar, N. A., & Hussain, A. H. (2021). application of topological concepts to the investigation of COVID-19 (modified) symptoms. Journal of interdisciplinary mathematics, 24(7), 1891–1899. http://access.bl.uk/ark:/81055/vdc_100148074427.0x000038