@article{nor91,
  author = {I. Norros and J. Roberts and A. Simonian and J. Virtamo},
  title = {The superposition of variable bit rate sources in an ATM multi¬plexer},
  journal = {IEEE Journal on Special Areas on Communications},
  year = {1991},
  volume = {9},
  number = {3},
  pages = {378--387},
}