@article{IM_1968__5_141909,
     author = {G.B. SELIGMAN},
     title = {On {Some} {Commutative} \"unipotent {Groups.}},
     journal = {Inventiones mathematicae},
     pages = {129--137},
     year = {1968},
     volume = {5},
     zbl = {0155.05802},
     url = {http://geodesic.mathdoc.fr/item/IM_1968__5_141909/}
}