“NATURAL RADIATION SOURCES AND TRAGIC CONSEQUENCES OF RADIATION, EARTH RADIATION, TEACHING A PRACTICAL LESSON ON THE TOPIC OF RADIOBIOLOGICAL PROCESSES USING THE ‘CLUSTER’ METHOD”. American Journal of Pedagogical and Educational Research, vol. 9, Feb. 2023, pp. 100-6, https://americanjournal.org/index.php/ajper/article/view/437.