@article{Sauerland2009,
  author    = {Uli Sauerland},
  title     = {Intermediate cumulation},
  journal   = {Snippets},
  volume    = {2001},
  number    = {4},
  pages     = {10 -- 11},
  url       = {http://www.zas.gwz-berlin.de/mitarb/homepage/sauerland/journals/snippets4003.pdf},
  year      = {2009},
}