Gosper–Niqui Calculator
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Milad Niqui: Exact arithmetic on the Stern-Brocot tree. https://core.ac.uk/download/pdf/82481132.pdf
HAKMEM p. 40 - ITEM 101B (Gosper): Continued Fraction Arithmetics https://w3.pppl.gov/~hammett/work/2009/AIM-239-ocr.pdf
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