There is no article in the NEC that states whether a GFCI will work without an EGC. That is a design issue that is part of the UL listing for the product.A gfci will work with two wires and no egc . what article in 2008 code?
If the OP is looking for where GFCI's can be used to replace non grounding type outlets (without an EGC present) see 406.3(D)(3)
Roger