@article{DBLP:journals/ibmrd/LangF77,
  author    = {Tom{\'a}s Lang and
               Eduardo B. Fern{\'a}ndez},
  title     = {Improving the Computation of Lower Bounds for Optimal Schedules},
  journal   = {IBM Journal of Research and Development},
  volume    = {21},
  number    = {3},
  year      = {1977},
  pages     = {273-280},
  ee        = {http://dx.doi.org/10.1147/rd.213.0273},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}