Daniell, J.E.[2010i]“A complete country-based temporal and spatial Human Development Index- 1800-2010”,
Digital Database and Report, Karlsruhe, Germany.
For example, in the 1990s, when the NottinghamCityCouncil in the UK considered installing a tram network,
it consulted experts from its twin city of Karlsruhe, which has one of the most extensive
and efficient tram networks in Germany.