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* {{cite journal |title=Calculator logic: when and why is RPN superior to algebraic? |author-first1=Errol |author-last1=Hoffman |author-first2=Patrick |author-last2=Ma |author-first3=Jason |author-last3=See |author-first4=Chee Kee |author-last4=Yong |author-first5=Jason |author-last5=Brand |author-first6=Matthew |author-last6=Poulton |journal=[[Applied Ergonomics]] |volume=25 |issue=5 |date=1994 |doi=10.1016/0003-6870(94)90048-5 |pages=327–333}}
* {{cite web |title=RPN or DAL? A brief analysis of Reverse Polish Notation against Direct Algebraic Logic |author-first=James |author-last=Redin |date=2005-02-12 |orig-date=1997-10-05 |url=http://www.xnumber.com/xnumber/rpn_or_adl.htm |access-date=2015-09-12 |url-status=live |archive-url=https://web.archive.org/web/20170624164945/http://www.xnumber.com/xnumber/rpn_or_adl.htm |archive-date=2017-06-24}}
* {{cite web |title=In our AP c++ class we are trying to use virtual stacks to devlop a infix to postfix calculator transalator. To study how exactly the infix notation and postfix notation differ we used on of the very old HP calculators. I was wondering that when you worked for HP did you help devlop some postfix calculators? Do you prefer infix notation or postfix? |editor-first=Stephen Gary "Woz" |editor-last=Wozniak |editor-link=Stephen Gary Wozniak |date=2017 |work=woz.org |department=Letters-General Questions Answered |url=http://archive.woz.org:80/letters/general/57.html |access-date=2023-09-23 |url-status=live |archive-url=https://web.archive.org/web/20171207183709/http://archive.woz.org:80/letters/general/57.html |archive-date=2017-12-07 |quote=My colleagues couldn't believe it. I told them that you just copy the formula from left to right but not one of them could see through their postfix fog. After all, these were the calculator experts of the world. They are well accustomed to thinking ahead and analyzing an expression to come up with the order of steps to take on an HP postfix calculator, and they had to remember which sub-expressions were in what order on the calculator's stack. None of them could do what I had done, forget that they have to be smart.}}
* {{cite book |title=Order of Operations and RPN |author-first=Greg |author-last=Vanderbeek |date=July 2007 |type=Expository paper |series=Master of Arts in Teaching (MAT) Exam Expository Papers |id=Paper 46 |publisher=[[University of Nebraska]] |___location=Lincoln, Nebraska, USA |url=https://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1045&context=mathmidexppap |access-date=2020-06-14 |url-status=live |archive-url=https://web.archive.org/web/20200614191608/https://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1045&context=mathmidexppap |archive-date=2020-06-14}}
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