Bikit, I. , Forkapic, S. , Nikolov, J. , Todorovic, N. , Mrdja, D. (2011), 'Radioactivity of the Agricultural Soil in Northern Province of Serbia, Vojvodina', World Academy of Science, Engineering and Technology, Open Science Index 52, International Journal of Environmental and Ecological Engineering, 5(4), 232 - 237.