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Pelli, D. G., Palomares, M., & Majaj, N. J. (2004). Crowding is unlike ordinary masking: Distinguishing feature integration from detection. Journal of Vision, 4(12):12, 1136-1169, http://journalofvision.org/4/12/12/, doi:10.1167/4.12.12.
http://journalofvision.org/4/12/12/