oai-pmh.md

@@ -49,12 +49,11 @@ For the element langstring the attribute xml:lang is used.
 ```
 
 ## Links
-https://www.openarchives.org/
-https://metacpan.org/pod/Net::OAI::Harvester
-https://validator.oaipmh.com/
-
-https://repository.tugraz.at/
-https://oer-repo.uibk.ac.at/
-
-https://www.openeducation.at/
-https://oerhub.at/
+- https://www.openarchives.org/
+- https://metacpan.org/pod/Net::OAI::Harvester
+- https://validator.oaipmh.com/
+- https://repository.tugraz.at/
+- https://oer-repo.uibk.ac.at/
+- https://standards.ieee.org/standard/1484_12_3-2020.html
+- https://www.openeducation.at/
+- https://oerhub.at/
\ No newline at end of file
\ No newline at end of file