M. . Shifrar, & J. B. Mulligan (1991) A Test for Models of Motion Processing: Nonrigidly Perceived Rotating Ellipses, 32nd annual meeting of the Psychonomic Society, 30
J. B. Mulligan, & M. . Shifrar (1991) Perception Of Rigidity With Rotating Ellipses, OSA Annual Meeting Technical Digest, 17, 225