@techreport{BarthelThomas2009,
  author    = {Barthel, Claus and Thomas, Stefan},
  title     = {Energy+ pumps : technology procurement for very energy efficient circulation pumps ; final report},
  institution = {Wuppertal Institut f{\"u}r Klima, Umwelt, Energie},
  address   = {Wuppertal},
  url       = {http://nbn-resolving.de/urn:nbn:de:bsz:wup4-opus-34314},
  pages     = {34},
  year      = {2009},
  language  = {en}
}