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P. Bochev, J. Hu, C. Siefert, and R. Tuminaro.
An algebraic multigrid approach based on a compatible gauge reformulation of Maxwell's equations.
SIAM J. Sci. Comp. Volume 31, Issue 1, pp. 557-0583, 2008.

2

P. Bochev, C. Siefert, R. Tuminaro, J. Xu, and Y. Zhu, Compatible Gauge Approaches for $H(div,\Omega)$ Equations. CSRI Summer proceedings, Sandia National Laboratories Report SAND-7977, pp. 3-14, 2007.