%0 Journal Article %T Computing the rank of U(ZA) %A I. G. Kelebek %A T. Bilgin %J International Journal of Algebra %D 2013 %I %K Integral group ring %K rank %K unit problem %U http://www.m-hikari.com/ija/ija-2013/ija-1-4-2013/kelebekIJA1-4-2013.pdf