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  1. 30804481310
    Author(s):Gertz, H.
    Title:Quelques remarques optiques.
    Subject(s):Optics
    Journal Title Abbreviation:Acta ophthalmol.
    Place of Publication:København
    Date of Publication:1923
    Pagination:i, 353–372.
    Language:Danish
    Type of Resource:Analytic
    Series/Volume/Page:Series 3/Volume 8/Page 448
  2. 30804481320
    Author(s):Gertz, H.
    Title:Un théorème relatif aux images catadioptriques de divers ordres, formées dans un système optique.
    Subject(s):Optics
    Journal Title Abbreviation:Acta ophthalmol.
    Place of Publication:København
    Date of Publication:1924–25
    Pagination:ii, 275–285.
    Language:Danish
    Type of Resource:Analytic
    Series/Volume/Page:Series 3/Volume 8/Page 448