ParnasS75'

@article{DBLP:journals/cacm/ParnasS75,
  author    = {David Lorge Parnas and
               Daniel P. Siewiorek},
  title     = {Use of the Concept of Transparency in the Design of Hierarchically
               Structured Systems},
  journal   = {Commun. ACM},
  volume    = {18},
  number    = {7},
  year      = {1975},
  pages     = {401-408},
  ee        = {http://doi.acm.org/10.1145/360881.360913},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}