@article{FerreinSchifferLakemeyer2011,
  author    = {Alexander Ferrein and Stefan Schiffer and Gerhard Lakemeyer},
  title     = {A Fuzzy Set Semantics for Qualitative Fluents in the Situation Calculus / Ferrein, Alexander ; Schiffer, Stefan ; Lakemeyer, Gerhard},
  journal   = {Intelligent Robotics and Applications : First International Conference, ICIRA 2008 Wuhan, China, October 15-17, 2008 Proceedings, Part I},
  pages     = {498 -- 509},
  year      = {2011},
}