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Zengul, Ferhat D., Ayse G. Zengul, Michael J. Mugavero, Nurettin Oner, Bunyamin Ozaydin, Dursun Delen, James H. Willig, Kierstin C. Kennedy, i James Cimino. "A Critical Analysis of COVID-19 Research Literature: Text Mining Approach." Intell Based Med 2021.

Zengul, Ferhat D., et al. "A Critical Analysis of COVID-19 Research Literature: Text Mining Approach." Intell Based Med 2021.