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Often they appear to be commercial sites or price comparison sites that charge people for being listed.
Are others seeing this pattern or are the resources in your areas genuinely quality sites.
If i have time to look into it with a couple of other things that were raised, i will see if i can find any sort of reasoning behind it.
Teoma may need to implement a PageRank-like algorithm to judge the quality of
these expert sites in order to make these citations more useful.
Personally, I'm just grateful to be included (free) and to have all those
long-dead URLs removed from their index!