Update gsm.md

Link to article describing the idea added.

README.md

@@ -12,4 +12,6 @@ SHA256 digest for the latest version of `GSM`: F*2FECDDB568B38E206CA4ADA6FDEF520
 
 [**Documentation for GSM**](./gsm.md "Documentation for GSM")
 
+[Article describing the idea](https://www.wuss.org/wuss-2023-conference-proceedings/ "Article about the idea GSM")
+
 To work with a package use the [**SAS Packages Framework**](https://github.com/yabwon/SAS_PACKAGES/blob/main/README.md "SPFinit").

gsm.md

@@ -42,7 +42,10 @@ run;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 See examples for more details.
 
-Recording of presentation with "how it works" description, in Polish, is avaliable [here](https://www.youtube.com/watch?v=LtaWPe2sgRY&t=1s).
+[Recording of presentation with "how it works" description (in Polish)](https://www.youtube.com/watch?v=LtaWPe2sgRY&t=1s "YouTube").
+
+[The WUSS 2023 Conference article describing the idea](https://www.wuss.org/wuss-2023-conference-proceedings/ "Article about the idea GSM")
+
 
 *How to use it:* 
  - Copy all files with your secured macros code into a directory.