1. 1. Brokhaus and Efron Encyclopedic Dictionary. De Metz Georgy Georgievich (St. Petersburg, 1906) (in Russian).
2. 2. Website of Taras Shevchenko National University of Kyiv. Retrieved July 31, 2019 from: http://univ.kiev.ua/en/geninf/history-rectors/de-metts/.
3. 3. Website of the National Technical University of Ukraine "Kyiv Polytechnic Institute". Retrieved August 2, 2019 from: https://kpi.ua/en/demetc.
4. 4. Website of Vadim Hetman National Economic University of Kyiv. Retrieved July 31, 2019 from: https://kneu.edu.ua/en/University_en/about_university/milest_of_hist/fam_teachers/.
5. 5. O. Maidebura, I. Gudkov. The outstanding physicist, organizer of higher education and science G. De-Metz - the first researcher in Ukraine of the effect of X-rays and natural radioactivity on living organisms. NUBiP Sci. Rep. 2012-4 33.