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  1. 40800871100
    Author(s):Heuven, J. A.
    Title:[Lighting and acuity of vision]
    Subject(s):Illumination Psychological aspect
    Journal Title Abbreviation:Ned. tschr. geneesk.
    Date of Publication:1936
    Pagination:80: 5502–13.
    Type of Resource:Analytic
    Series/Volume/Page:Series 4/Volume 8/Page 87
  2. 40800871900
    Author(s):van der Waals, H. G.
    Title:*Optische schijnbeweging.
    Subject(s):Illusion geometrico-optical, and visual
    Place of Publication:Amst.
    Date of Publication:1927
    Type of Resource:Dissertation
    Series/Volume/Page:Series 4/Volume 8/Page 87