Analysis of 226Ra, 232Th 40К and 137Cs in samples of soil from some areas of Republic of Macedonia by using gamma spectrometry - Todorovic Aleksandra; Dimitrieska Stojkovikj, Elizabeta; Hajrulai musliu, Zehra; Uzunov, Risto; Stojanovska-Dimzoska Biljana (Mac Vet Rev, 2013)