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A note on Abhyankar-Moh's approximate roots of polynomials. Brzostowski, Szymon (2007) Zeszyty Naukowe Uniwersytetu Jagiellońskiego. Universitatis Iagellonicae Acta Mathematica
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An example of a locally unbounded complete extension of the p-adic number field W. Więsław (1974) Colloquium Mathematicae