Landwehr80'

@article{DBLP:journals/toplas/Landwehr80,
  author    = {Carl E. Landwehr},
  title     = {An Abstract Type for Statistics Collection in Simula},
  journal   = {ACM Trans. Program. Lang. Syst.},
  volume    = {2},
  number    = {4},
  year      = {1980},
  pages     = {544-563},
  ee        = {http://doi.acm.org/10.1145/357114.357118},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}