RPN delphi

http://maciejewski.com/en/implementation-of-the-rpn-parser-in-delphi/

http://maciejewski.com/en/calculation-of-mathematical-expressions-using-rpn-in-delphi/

http://www.cnblogs.com/jxgxy/archive/2009/11/09/1599153.html

http://blog.youkuaiyun.com/beiyetengqing/article/details/8066568

https://ru.wikiversity.org/wiki

http://blog.youkuaiyun.com/beiyetengqing/article/details/8066568

http://maciejewski.com/en/implementation-of-the-rpn-parser-in-delphi/