0,999... (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "0,999..." in Portuguese language version.

refsWebsite

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1books.google.com

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books.google.com

Leonhard Euler (1822) [1770]. John Hewlett and Francis Horner, English translators., ed. Elements of Algebra 3rd English ed. [S.l.]: Orme Longman. ISBN 0387960147 ISBN 0-38796-014-7