The wiki says this about Accelerator's Vector Transformation:
It is said to even be able to reflect teleportation vectors in the 11th dimension, though a strange phenomenon would occur in the 3-dimensional world, so thus people could not teleport harmful objects into his body, as most Teleporters would do in a battle.
However, no source is cited. I've searched the entire light novel for it, and haven't found where "It is said".
Is their claim true? Where is that stated in the series?