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* {{cite book |last=Carathéodory |first=Constantin |author-link=Constantin Carathéodory |title=Theory of functions of a complex variable |volume=2 |translator=F. Steinhardt |publisher=Chelsea |year=1954|url=https://books.google.com/books?id=UTTvAAAAMAAJ}}
* {{Cite book |last=Hille |first=Einar |author-link=Einar Hille |url=https://www.worldcat.org/oclc/36225146 |title=Ordinary differential equations in the complex ___domain |date=1997 |publisher=Dover Publications |isbn=0-486-69620-0 |___location=Mineola, N.Y. |oclc=36225146}}
* {{cite book |last1=Sansone |first1=Giovanni |author-link=Giovanni Sansone |last2=Gerretsen |first2=Johan |title=Lectures on the theory of functions of a complex variable. II: Geometric theory |publisher=Wolters-Noordhoff |year=1969 }}
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