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\section{Endnotes and references}  This article has already cited quite a few endnotes, using the \verb/\cite/  macro. See the end of this article (and source file) for the endnotes  themselves, which are in an environment called \texttt{thebibliography}  and are created with the \verb/\bibitem/ macro. These macros require  you to give each endnote a name. The notes will be numbered in the  order in which the \verb/\bibitem/ entries appear, and AJP requires that  this order coincide with the order in which the notes are first cited in   the article. You can cite multiple endnotes in a single \verb/\cite/,   separating their names by commas. And you can cite each note as many   times as you like.  Notice that in the AJP (and Physical Review B) style, the citation numbers   appear as superscripts. Think carefully about the optimal placement of  each citation, and try not to attach citations to math symbols where the  numbers might be misinterpreted as exponents. Often there will be a  punctuation symbol after the word where you attach the citation; you  should then put the citation \textit{after} the punctuation, not   before.\cite{nevermindlogic}  If you want to refer directly to Ref.~\onlinecite{mermin} (or any other)   in a sentence, you can do so with the \verb/\onlinecite/ macro.  Most endnotes consist of bibliographic citations.\cite{noBIBTeX} Be sure   to learn and use the AJP styles for citing books,\cite{latexbook}   articles,\cite{dyson} edited volumes,\cite{examplevolume} and  URLs.\cite{latexsite} For example, article titles are in double quotes,   while book titles are in italics. Pay careful attention to all punctuation   symbols in citations. Note that AJP requires that all article citations   include titles as well as beginning and ending page numbers.  Please use standard abbreviations, as listed in the AIP Style   Manual,\cite{AIPstylemanual} for journal titles.