Hansen72'

@article{DBLP:journals/acta/Hansen72,
  author    = {Per Brinch Hansen},
  title     = {A Comparison of Two Synchronizing Concepts},
  journal   = {Acta Inf.},
  volume    = {1},
  year      = {1972},
  pages     = {190-199},
  ee        = {http://dx.doi.org/10.1007/BF00288684},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}