@article{MZ_1982__179_173140,
     author = {D. Segal and F.J. Grunewald and L.S. Sterling},
     title = {Nilpotent {Groups} of {Hirsch} {Length} {Six.}},
     journal = {Mathematische Zeitschrift},
     pages = {219--236},
     year = {1982},
     volume = {179},
     zbl = {0497.20026},
     url = {http://geodesic.mathdoc.fr/item/MZ_1982__179_173140/}
}