Kahneman, Daniel, and Jackson Beatty, “Pupil Diameter and Load on Memory”, Science 154, no. 3756 (December 23, 1966), pp. 158–155.
310
Engbert, Ralf, and Reinhold Kliegl, “Microsaccades Uncover the Orientation of Covert Attention”, Vision Research 43, no. 9 (April 2003), pp. 1035–1045, http://www.sciencedirect.com/science/article/pii/S0042698903000841.
