Geodesic
Two-sided a~posteriori error bounds for electro-magneto static problems
Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 40, Tome 370 (2009), pp. 94-110

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This paper is concerned with the derivation of computable and guaranteed upper and lower bounds of the difference between the exact and the approximate solution of a boundary value problem for static Maxwell equations. Our analysis is based upon purely functional argumentation and does not attract specific properties of an approximation method. Therefore, the estimates derived in the paper at hand are applicable to any approximate solution that belongs to the corresponding energy space. Such estimates (also called error majorants of the functional type) have been derived earlier for elliptic problems [19, 20]. Bibl. – 24 titles. 
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     author = {D. Pauly and S. Repin},
     title = {Two-sided a~posteriori error bounds for electro-magneto static problems},
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     pages = {94--110},
     publisher = {mathdoc},
     volume = {370},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2009_370_a5/}
}
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D. Pauly; S. Repin. Two-sided a~posteriori error bounds for electro-magneto static problems. Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 40, Tome 370 (2009), pp. 94-110. http://geodesic.mathdoc.fr/item/ZNSL_2009_370_a5/