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2. 2. Encyclopaedia Britannica. https://www.britannica.com.
3. 3. The Great Ukrainian Encyclopedia. https://vue.gov.ua.
4. 4. Andon F.I., Yashunin A.E., Reznichenko V.A. Logical models of intellectual information systems. K.: Naukova Dumka. 1999. 396 p. (in Russian)
5. 5. Wikipedia - https:// www. wikipedia.org.