@article{10_4064_cm_53_2_249_253,
     author = {Ewa Damek},
     title = {Curvature of a semi-direct extension of a {Heisenberg} type nilpotent group},
     journal = {Colloquium Mathematicum},
     pages = {249--253},
     publisher = {mathdoc},
     volume = {53},
     number = {2},
     year = {1987},
     doi = {10.4064/cm-53-2-249-253},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-53-2-249-253/}
}