diff --git a/docs/source/refs.bib b/docs/source/refs.bib
index 06c6567..6a0de07 100644
--- a/docs/source/refs.bib
+++ b/docs/source/refs.bib
@@ -524,39 +524,31 @@
     year=2009
 }
 @misc{ISBD,
-    title="...",
-    author="...",
-    publisher="",
-    url="",
-    year=1000
+    title="International Standard Bibliographic Description",
+    author="IFLA",
+    publisher="IFLA",
+    year=2011
 }
 @misc{MARC21,
-    title="...",
-    author="...",
-    publisher="",
-    url="",
-    year=1000
+    title="MARC 21",
+    author="Library of Congress",
+    publisher="Library of Congress",
+    url="https://www.loc.gov/marc/bibliographic/",
+    year=2020
 }
 @misc{MarcXML,
-    title="...",
-    author="...",
-    publisher="",
-    url="",
-    year=1000
+    title="MarcXML",
+    author="Library of Congress",
+    publisher="Library of Congress",
+    url="https://www.loc.gov/standards/marcxml/",
+    year=2020
 }
 @misc{UNIMARC,
-    title="...",
-    author="...",
-    publisher="",
-    url="",
-    year=1000
-}
-@misc{INTERMARC,
-    title="...",
-    author="...",
-    publisher="",
-    url="",
-    year=1000
+    title="UNIMARC Manual – Bibliographic Format, 3rd ed.",
+    author="IFLA",
+    publisher="IFLA",
+    isbn="978-3-598-24284-7",
+    year=2008
 }
 @misc{DigitalItemDeclaration,
     title="...",
@@ -628,61 +620,54 @@
     url="https://www.transition-bibliographique.fr/rda-fr/pdf-regles-rda-fr/",
     year=2020
 }
-@misc{IFLA,
-    title="...",
-    author="...",
-    publisher="",
-    url="",
-    year=1000
-}
 @misc{FRAD,
-    title="...",
-    author="...",
-    publisher="",
-    url="",
-    year=1000
-}
-@misc{FRAR,
-    title="...",
-    author="...",
-    publisher="",
-    url="",
-    year=1000
+    title="Functional Requirements for Authority Data",
+    author="IFLA",
+    publisher="IFLA",
+    url="https://www.ifla.org/files/assets/cataloguing/frad/frad_2013.pdf",
+    year=2013
 }
 @misc{FRSAD,
-    title="...",
-    author="...",
-    publisher="",
-    url="",
-    year=1000
+    title="Functional Requirements for Subject Authority Data (FRSAD)",
+    author="IFLA",
+    publisher="IFLA",
+    url="https://www.ifla.org/files/assets/classification-and-indexing/functional-requirements-for-subject-authority-data/frsad-final-report.pdf",
+    year=2011
 }
 @misc{FRBR,
-    title="...",
-    author="...",
-    publisher="",
-    url="",
-    year=1000
+    title="Functional Requirements for Bibliographic Records",
+    author="IFLA",
+    publisher="IFLA",
+    url="https://www.ifla.org/files/assets/cataloguing/frbr/frbr_2008.pdf",
+    year=2009
 }
 @misc{LRM,
-    title="...",
-    author="...",
-    publisher="",
-    url="",
-    year=1000
+    title="IFLA Library Reference Model",
+    author="IFLA",
+    publisher="IFLA",
+    url="https://www.ifla.org/files/assets/cataloguing/frbr-lrm/ifla-lrm-august-2017_rev201712.pdf",
+    year=2017
 }
 @misc{DRMLCP,
-    title="...",
-    author="...",
+    title="Readium Licensed Content Protection 1.0",
+    author="EDRLab",
     publisher="EDRLab",
-    url="",
-    year=1000
+    url="https://readium.org/lcp-specs/releases/lcp/latest.html",
+    year=2019
 }
-@misc{Fediverse,
-    title="...",
-    author="...",
-    publisher="",
-    url="",
-    year=1000
+@misc{DRMLCPStatus,
+    title="Readium License Status Document 1.0",
+    author="EDRLab",
+    publisher="EDRLab",
+    url="https://readium.org/lcp-specs/releases/lsd/latest.html",
+    year=2018
+}
+@misc{ActivityPub,
+    title="ActivityPub",
+    author="Christopher Lemmer Webber and Jessica Tallon and Erin Shepherd and Amy Guy and Evan Prodromou",
+    publisher="W3C",
+    url="https://www.w3.org/TR/2018/REC-activitypub-20180123/",
+    year=2018
 }
 @misc{Vidiverse,
     title="...",
@@ -691,34 +676,6 @@
     url="",
     year=1000
 }
-@misc{Electre,
-    title="...",
-    author="...",
-    publisher="",
-    url="",
-    year=1000
-}
-@misc{PRISM,
-    title="...",
-    author="...",
-    publisher="",
-    url="",
-    year=1000
-}
-@misc{Dilicom,
-    title="...",
-    author="...",
-    publisher="",
-    url="",
-    year=1000
-}
-@misc{Dilibel,
-    title="...",
-    author="...",
-    publisher="",
-    url="",
-    year=1000
-}
 @misc{COGA-Usable,
     title="Making Content Usable for People with Cognitive and Learning Disabilities",
     author="Lisa Seeman-Horwitz and Rachael Bradley Montgomery and Steve Lee and Ruoxi Ran",
diff --git a/docs/source/specifications/documents.rst b/docs/source/specifications/documents.rst
index 85ec8cc..e5609ab 100644
--- a/docs/source/specifications/documents.rst
+++ b/docs/source/specifications/documents.rst
@@ -89,7 +89,7 @@ Metadata:
 - Compatibility with ISBD, MARC21, MarcXML, UNIMARC,
   INTERMARC, DID - Digital Item Declaration,
   DCMI, BIBFRAME, MODS, EAD, METS, PREMIS,
-  MPEG21-DIDL, RDA, RDA-FR, IFLA, FRAD, FRAR,
+  MPEG21-DIDL, RDA, RDA-FR, FRAD,
   FRSAD, FRBR and LRM
 - Support of ISBN, ISSN and EAN
 - Recommendation