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- Who Named the Radian?
- Michael Cooper
- The Mathematical Gazette, Vol. 76, No. 475, The Use of the History of Mathematics in the Teaching of Mathematics (Mar., 1992), pp. 100-101
- The Word "Radian"
- A. R. Crathorne
- The American Mathematical Monthly, Vol. 19, No. 10/11 (Oct. - Nov., 1912), p. 166