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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Crisman, P.A., ed. (December 31, 1969). "The Compatible Time-Sharing System, A Programmer's Guide" (PDF). The M.I.T Computation Center. Retrieved March 10, 2022. <a href="http://www.bitsavers.org/pdf/mit/ctss/CTSS_ProgrammersGuide_Dec69.pdf" target="_blank">http://www.bitsavers.org/pdf/mit/ctss/CTSS_ProgrammersGuide_Dec69.pdf</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>