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I added some wikilinks but left that notice up as I am quitting for lack of time and maybe more can be done there. I also agree that the article needs more explanation. I am not sure whether we can assume the reader already knows what a molecule is, but expecting to not need to define HUMO and LUMO is probably expecting too much Elinruby ( talk) 00:12, 17 May 2016 (UTC) reply