@article{10_4064_sm201_2_2,
     author = {Rafa/l  Piku{\l}a},
     title = {On enveloping semigroups of nilpotent group actions generated by unipotent affine transformations of the torus},
     journal = {Studia Mathematica},
     pages = {133--153},
     publisher = {mathdoc},
     volume = {201},
     number = {2},
     year = {2010},
     doi = {10.4064/sm201-2-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm201-2-2/}
}