“Determination of Activity Concentration of 40K and Gross Beta activity in Soil from Kavadarci and its Environs”, GeolMac, vol. 24, no. 1/2, pp. pp.53–62, Apr. 2013, Accessed: Nov. 04, 2025. [Online]. Available: https://js.ugd.edu.mk/index.php/GEOLMAC/article/view/261