* FE_Nothing elements are used. The hp::DoFHandler will therefore assign no
* degrees of freedom to the FE_Nothing cells, and this subregion is therefore
* implicitly deleted from the computation. step-46 shows a use case for this
- * element.
+ * element. An interesting application for this element is also presented in the
+ * paper A. Cangiani, J. Chapman, E. Georgoulis, M. Jensen:
+ * <b>Implementation of the Continuous-Discontinuous Galerkin Finite Element Method</b>,
+ * arXiv:1201.2878v1 [math.NA], 2012 (see http://arxiv.org/abs/1201.2878).
*
* Note that some care must be taken that the resulting mesh topology
* continues to make sense when FE_Nothing elements are introduced.
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