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\item[Discipline] Citation practices vary widely among various fields.  Citation rates can vary between disciplines by an order of  magnitude \cite{leydes}; among sub-disciplines in the same discipline they can  vary by a factor of two (see Figure \ref{fig:mVSdisc}, discussed later). two.  \item[Co-Authorship] A paper can have an arbitrary number of authors, from  one to several thousand. Should an author of a single authored paper