Humphreys, G., & Olson, A. (2001). Separating effects of orthographic similarity and contour summation in the identification of masked letter strings.

Humphreys, G., and A. Olson. Separating Effects of Orthographic Similarity and Contour Summation in the Identification of Masked Letter Strings. 2001.

Humphreys, G., and A. Olson. Separating Effects of Orthographic Similarity and Contour Summation in the Identification of Masked Letter Strings. 2001.