Target and nontarget grouping in visual search. Duncan, J. Perception \& Psychophysics, 57(1):117-120, 1995.
bibtex   
@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}
}

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