Update mumps documents link

REFERENCE.md

@@ -1,9 +1,11 @@
 # M[UMPS] 参考 (Reference)
+
 M 语言的参考很乱，到目前为止也没有找到非常多的有效文件。
 
 在这个页面中，我们对网络上能收集到的文档和资料进行归档，以便于大家快速下载。
 
 # M Programming Language
+
 MUMPS (M) is a high performance transaction processing key–value database with integrated programming language.
 
 __M history__  
@@ -29,7 +31,6 @@ M example code
 https://github.com/programarivm/mumps-examples  
 http://71.174.62.16/Demo/AnnoStd?Frame=Main&Page=a100006
 
-
 M books  
 https://www.amazon.com/Mumps-Programming-Language-Kevin-OKane-ebook/dp/B00MZIMA1M
 
@@ -51,6 +52,7 @@ http://www.vistapedia.net/index.php/VistA_Database_Globals
 http://www.vistapedia.net/index.php/Object_Oriented_Programming_with_M
 
 ## M implementations
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 __Reference standard mumps (RSM)__  
 https://gitlab.com/Reference-Standard-M/rsm
 
@@ -60,30 +62,35 @@ https://yottadb.com/product/get-started/
 https://docs.yottadb.com/ProgrammersGuide/devcycle.html#overview-of-the-program-development-cycle  
 https://yottadb.com/connect-microsoft-analytics-and-business-intelligence-tools-to-octo/
 
-
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 ### JSR
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 https://mumps-dev.github.io/jsr/
 
+### MUMPS Tutorials
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+[Mumps 语言有关多层次和维度的程序员工具包指南(The Multi-Dimensional and Hierarchical Database Toolkit Programmer’s Guide)](https://www.isharkfly.com/t/the-multi-dimensional-and-hierarchical-database-toolkit-programmers-guide/16033)
+[Mumps 语言快速基本概述(A Quick Overview of the Basics of the Mumps Language)](https://www.isharkfly.com/t/mumps/16037)
+[Mumps 程序语言解释器编译器和 C++ 类库用户指南](https://www.isharkfly.com/t/mumps-c/16038)
+[Mumps 语言标准指南 - 1995 年版](https://www.isharkfly.com/t/mumps-1995/16039)
+[Mumps 语言开发标准 2020 年草案](https://www.isharkfly.com/t/mumps-2020/16040)
 
-### MUMPS Tutorials - Prof O'Kane
 https://www.cs.uni.edu/~okane/index.html  
 https://www.cs.uni.edu/~okane/mumps.html  
 https://www.cs.uni.edu/~okane/youtube.html#mumps  
 https://youtube.com/playlist?list=PLmMgHNtOIstYpwQRy5btu-P-Gl90IsjPM
 
-
 ### Hacker News
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 Introduction to the Mumps Language  
 https://news.ycombinator.com/item?id=16309237  
 https://news.ycombinator.com/item?id=13859961
 
 ### Daily WTF
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 https://thedailywtf.com/articles/MUMPS-Madness  
 https://thedailywtf.com/articles/A_Case_of_the_MUMPS  
 https://robtweed.wordpress.com/2012/10/21/a-case-of-the-mumps/
 
 ### M Developer gits
+
 https://github.com/robtweed