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References
- 1 2 Shikin, E. V. (2001) [1994], "Affine sphere", Encyclopedia of Mathematics , EMS Press
- ↑ "Google Scholar Search". Google Inc.
- ↑ Buchin, S. (1983). Affine differential geometry . Sci. Press and Gordon & Breach. ISBN 0-677-31060-9.
- ↑ Ishikawa, G.; Machida, Y. (2005). "Singularities of improper affine spheres and surfaces of constant Gaussian curvature". arXiv: math/0502154 . Bibcode:2005math......2154I.Cite journal requires
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