Съотношение (Bulgarian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Съотношение" in Bulgarian language version.

refsWebsite

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1books.google.com

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books.google.com

Wentworth, George, David Eugene Smith, Herbert Druery Harper. Ratio and Proportion // Fundamentals of practical mathematics. Ginn and Co., 1922. p. 55. (на английски)