@article{9c9e504bc6f84e8b9998a7c916b68a69,
title = "Einstein metrics with nonpositive sectional curvature on extensions of Lie algebras of heisenberg type",
keywords = "Human geography, Sociale Geografie(SGEO), Consumer Economics: Theory, Economic geography, Planologie(PLAN), Consumer Economics: Empirical Analysis, Geowetenschappen en aanverwante (milieu)wetenschappen",
author = "M. Lanzendorf",
year = "1997",
language = "Undefined/Unknown",
volume = "66",
pages = "187--202",
journal = "Geometriae Dedicata",
issn = "0046-5755",
publisher = "Springer Netherlands",
}