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| publisher = Oxford University Press
| title = Mathematical Models
| title-link = Mathematical Models (Cundy and Rollett)
| year = 1961}}</ref>
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→Constructions: sums of hedgehogs |
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Line 145:
| publisher = Oxford University Press
| title = Mathematical Models
| title-link = Mathematical Models (Cundy and Rollett)
| year = 1961}}</ref>
|