Donut-shaped elastic torus and its cross-section.

Torus -- from Wolfram MathWorld

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PDF) Geometry-Induced Rigidity in Elastic Torus from Circular to Oblique Elliptic Cross-Section

Torus - Wikipedia

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Cylindrical shells to find volume of a torus

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Current – Intro to Physics for Non-Majors

Torus - Wikipedia

Gol'denveizer's problem of elastic torus - ScienceDirect

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Section 5.1 Rubber Sheet Geometry Discovering the Topological Idea of Equivalence by Distortion. “The whole of mathematics is nothing more than a refinement. - ppt download

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