@article{HoefnerMoeller2009,
  author    = {Peter H{\"o}fner and Bernhard M{\"o}ller},
  title     = {An algebra of hybrid systems},
  journal   = {The Journal of Logic and Algebraic Programming},
  volume    = {78},
  number    = {2},
  pages     = {74 -- 97},
  doi       = {10.1016/j.jlap.2008.08.005},
  year      = {2009},
}