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.. _known_issues:

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A. Known Issues
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- Many more references could be given in :numref:`nonlinear_behavior-introduction`.
- Many, if not all, Epic materials models have no theory documentation. We recommend searching the open literature.
- Particle methods, such as Smooth Particle Hydrodynamics, are undocumented.
- Representative volume elements are undocumented. However a reference paper does exist.
