@article{LentSwie93b,
  author  = {Lentfert, P. J. A. and Swierstra, S. D.},
  title   = {Distributed Maximum Maintenance on Hierarchically Divided Graphs},
  journal = {Formal Aspects of Computing},
  year    = {1993},
  volume  = {5},
  number  = {1},
  pages   = {21-60},
}