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The Eleventh Marcel Grossmann Meeting
The Newtonian approximation for the gravitational field equation should not necessarily involve admission of non-relativistic properties of the source terms in Einstein's equations: it is sufficient to merely consider the weak-field condition for gravitational field. When a source has electromagnetic nature, one simply cannot ignore its intrinsically relativistic properties, since there cannot be invented any non-relativistic approximation which would describe electromagnetic stress-energydoi:10.1142/9789812834300_0342 fatcat:ukxch2aaazefjhaxmhj53ytrla