%0 Journal Article %A Rafa/l PikuĊ‚a %T On enveloping semigroups of nilpotent group actions generated by unipotent affine transformations of the torus %J Studia Mathematica %D 2010 %P 133-153 %V 201 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm201-2-2/ %R 10.4064/sm201-2-2 %G en %F 10_4064_sm201_2_2