%0 Journal Article %A Finston, David %A Maubach, Stefan %T Constructing (Almost) Rigid Rings and a UFD Having Infinitely Generated Derksen and Makar-Limanov Invariants %J Canadian mathematical bulletin %D 2010 %P 77-86 %V 53 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-2010-017-8/ %R 10.4153/CMB-2010-017-8 %F 10_4153_CMB_2010_017_8