@article{ Duncan95a,
  author = {Duncan, J.},
  title = {Target and nontarget grouping in visual search},
  journal = {Perception \& Psychophysics},
  year = {1995},
  volume = {57},
  pages = {117-120},
  number = {1},
  en_number = {2.4:95},
  keywords = {perceptual grouping}
}