APA-viite (7. p.)
Heitger, F. (1987). Luminance Transduction and contrast discrimination measured by afterimages: (With summary.).
Chicago-viite (17. p.)
Heitger, Friedrich. Luminance Transduction and Contrast Discrimination Measured by Afterimages: (With Summary.). Zürich, 1987.
MLA-viite (9. p.)
Heitger, Friedrich. Luminance Transduction and Contrast Discrimination Measured by Afterimages: (With Summary.). 1987.
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