@article{GlueckMoeller2008,
  author    = {Roland Gl{\"u}ck and Bernhard M{\"o}ller},
  title     = {Circulations, fuzzy relations and semirings},
  journal   = {Lecture Notes in Computer Science},
  volume    = {5133},
  pages     = {134 -- 152},
  doi       = {10.1007/978-3-540-70594-9_9},
  year      = {2008},
}