File:Katona József értekezése.jpg
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![File:Katona József értekezése.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/3/37/Katona_J%C3%B3zsef_%C3%A9rtekez%C3%A9se.jpg/355px-Katona_J%C3%B3zsef_%C3%A9rtekez%C3%A9se.jpg?20180930095458)
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