@article{GFA_1994__4_6_58179,
     author = {A. Leibman},
     title = {Multiple {Recurrence} {Theorem} for {Nilpotent} {Group} {Actions.}},
     journal = {Geometric and functional analysis},
     pages = {648--659},
     publisher = {mathdoc},
     volume = {4},
     number = {6},
     year = {1994},
     zbl = {0848.54025},
     url = {http://geodesic.mathdoc.fr/item/GFA_1994__4_6_58179/}
}