Recent Studies of an Interesting Optical Illusion; Optische Urtheilstauschungen; Ueber ein optisches Paradoxon; Optische Streitfragen; Ueber ein optisches Paradoxon (Zweiter Artikel); Une nouvelle illusion d'optique; Les illusions d'optique; Zur Lehre von den optischen Tauschungen; Erklarung der Brentano'schen optischen Tauschung;

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