So, point Qiqqa's Web Browser to the Google Scholar result page that lists all the citations to your paper A.
Clicking Qiqqa's button will download all the linked pdfs (good and bad) that are shown on the Scholar page! A Qiqqa window will ask you which of your libraries you want to download them to. If some files are not PDFs, Qiqqa will warn you, and you can skip past each. Repeat if the Scholar results are lengthy and are returned on more than one page. If you have previously been careful to tag all files in that library, the new files will all be untagged, and you can select all Untagged files to tag them (or delete the bad ones) at your leisure! (C) Ian G. Kennedy