@article{BerghammerMoellerStruth2019,
  author    = {Rudolf Berghammer and Bernhard M{\"o}ller and Georg Struth},
  title     = {Preface: relational and Kleene-algebraic methods in computer science},
  journal   = {Lecture Notes in Computer Science},
  volume    = {3051},
  pages     = {VII},
  doi       = {10.1007/b98117},
  year      = {2019},
}