I'll second the call for heat. I've used a propane torch on bearings to warm them up and the bearing will suffer no ill results. The trick is to warm the bearing and not the hub it is located on. You could also cool the inner portion of the hub (here in Manitoba we would use snow; it snowed again last night, leacing small drifts here and there) just to make the difference.
Anything heated red enough will let go eventually, even if it was never meant to.
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