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In writing blog articles,I often gave reference addresses on the www where more information or sources can be found for my articles under discussion. However, in re-reading some of my past articles recently I found that some of the addresses I gave reference to in the  past no longer contain the source article. Instead they were replaced by other more  current information. One has to search among the archives of that source to find the  information. Worse, sometimes the information was simply deletedand replaced by other  contents. This is particularly true for some Chinese language sites which do not  bother to archive older contents. My apologies. There is nothing I can do.