%0 Journal Article %A Vogelius, Michael S. %A Volkov, Darko %T Asymptotic formulas for perturbations in the electromagnetic fields due to the presence of inhomogeneities of small diameter %J ESAIM: Modélisation mathématique et analyse numérique %D 2000 %P 723-748 %V 34 %N 4 %I Dunod %C Paris %U http://www.numdam.org/item/M2AN_2000__34_4_723_0/ %G en %F M2AN_2000__34_4_723_0