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==References==
{{reflist|refs=
<ref name="Ball_1978">{{cite book |title=Algorithms for RPN calculators |author-first=John A. |author-last=Ball |date=1978 |edition=1 |publisher=[[Wiley-Interscience]], [[John Wiley & Sons, Inc.]] |___location=Cambridge, Massachusetts, USA |isbn=0-471-03070-8 |lccn=77-14977 |url=https://archive.org/details/algorithmsforrpn0000ball |url-access=registration |access-date=2023-09-21}}</ref>
<ref name="TI EOS vs AOS">{{cite web |title=Differences Between Algebraic Operating System (AOS) and Equation Operating System (EOS) |publisher=[[Texas Instruments]] |date= |url=https://education.ti.com/en/customer-support/knowledge-base/ti-83-84-plus-family/product-usage/12705 |access-date=2022-11-29 |url-status= |archive-url= |archive-date=}}</ref>
<ref name="Thimbleby_1998">{{cite web |title=A new calculator and why it is necessary |author-first=Harold W. |author-last=Thimbleby |author-link=Harold W. Thimbleby |publisher=Computing Science, Middlesex University |___location=London, UK |date=September 1998 |url=http://www.uclic.ucl.ac.uk/harold/srf/allcalcs.pdf |access-date=2009-05-04 |url-status=dead |archive-url=https://web.archive.org/web/20070207044654/http://www.uclic.ucl.ac.uk/harold/srf/allcalcs.pdf |archive-date=2007-02-07}}</ref>
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