@techreport{LangrockSterk2004,
  type      = {Working Paper},
  author    = {Langrock, Thomas and Sterk, Wolfgang},
  title     = {The supplementarity challenge : CDM, JI \& EU emissions trading},
  series    = {Policy Paper / Wuppertal Institut f{\"u}r Klima, Umwelt, Energie},
  volume    = {2004,1},
  institution = {Wuppertal Institute for Climate, Environment and Energy},
  address   = {Wuppertal},
  pages     = {14},
  year      = {2004},
  language  = {en}
}