@article{HoefnerMoeller2016,
  author    = {Peter H{\"o}fner and Bernhard M{\"o}ller},
  title     = {Extended feature algebra},
  journal   = {Journal of Logical and Algebraic Methods in Programming},
  volume    = {85},
  number    = {5},
  pages     = {952 -- 971},
  doi       = {10.1016/j.jlamp.2015.12.002},
  year      = {2016},
}