@article{JLT_2002_12_1_JLT_2002_12_1_a4,
     author = {G. Crandall and J. Dodziuk },
     title = {Integral {Structures} on {H-type} {Lie} {Algebras}},
     journal = {Journal of Lie theory},
     pages = {69--79},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {2002},
     url = {http://geodesic.mathdoc.fr/item/JLT_2002_12_1_JLT_2002_12_1_a4/}
}