are not always driven by pure scientific reasons. Ideally, all these differences in citations could be incorporated in a scientific citation markup like \cite[markup]{RefKeyForPaper} (in LaTeX citation style) or the like. Some ideas: \cite[negative]{PaperWithSevereErrors} \cite[community feeling]{PopularPaperWithNoSpecificRelation} \cite[please journal editor]{AnyPaperOfEditor} \cite[enforced by a referee]{SuggestedPaper} \cite[proof or evidence elsewhere]{TechnicalPaper} (The latter can be