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"Common Tangents to Four Unit Balls in R3."
I. G. MacDonald, János Pach, Thorsten Theobald (2001)
- I. G. MacDonald, János Pach, Thorsten Theobald:
Common Tangents to Four Unit Balls in R3. Discret. Comput. Geom. 26(1): 1-17 (2001)

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