Abstract
There are only a few cases for cyclic groups C-n; where the unit group of their integral group rings are determined. In this article, we have completed the characterization of torsion-free part V(ZC(n)(+)) of the integral group ring of cyclic group C-n, for n = 11; 15; 16; 20; 24 and 30 where rho <= 4. We explicitly find all the generators.