diff --git a/scripts/validate-register.rb b/scripts/validate-register.rb
index 4e3a68f..353e9d5 100644
--- a/scripts/validate-register.rb
+++ b/scripts/validate-register.rb
@@ -132,6 +132,10 @@
             report.call(key, "#{name}:#{File.basename(f)}:#{ln}: " \
                              "unbalanced nofetch( parenthesis")
           end
+          if entry =~ /\]\]\]\s*$/
+            report.call(key, "#{name}:#{File.basename(f)}:#{ln}: " \
+                             "bare anchor (renders an empty citation chip)")
+          end
         end
       end
     end
diff --git a/sources/unitsml-36814-unitsdb/sections/02-normrefs.adoc b/sources/unitsml-36814-unitsdb/sections/02-normrefs.adoc
index de2754f..ff7a353 100644
--- a/sources/unitsml-36814-unitsdb/sections/02-normrefs.adoc
+++ b/sources/unitsml-36814-unitsdb/sections/02-normrefs.adoc
@@ -1,8 +1,8 @@
 [bibliography]
 == Normative references
 
-* [[[unitsml-36812,nofetch(CalConnect 36812)]]]
-* [[[unitsml-36813,nofetch(CalConnect 36813)]]]
+* [[[unitsml-36812,nofetch(CalConnect 36812)]], general
+* [[[unitsml-36813,nofetch(CalConnect 36813)]], numeric
 * [[[iso4217,ISO 4217]]] (currency codes)
 * [[[iec62720,nofetch(IEC 62720)]]] (units dictionary; source corpus only — no IEC backing of this register is implied)
 * [[[cc36811,nofetch(CalConnect 36811)]]], _UnitsML — UnitsDB specification_ (v1 base standard, frozen 2025-03; historical)
diff --git a/sources/unitsml-36815-units-model/sections/02-normrefs.adoc b/sources/unitsml-36815-units-model/sections/02-normrefs.adoc
index 2c4692d..708ea39 100644
--- a/sources/unitsml-36815-units-model/sections/02-normrefs.adoc
+++ b/sources/unitsml-36815-units-model/sections/02-normrefs.adoc
@@ -1,9 +1,9 @@
 [bibliography]
 == Normative references
 
-* [[[unitsml-36812,nofetch(CalConnect 36812)]]]
-* [[[unitsml-36813,nofetch(CalConnect 36813)]]]
-* [[[unitsml-36814,nofetch(CalConnect 36814)]]]
+* [[[unitsml-36812,nofetch(CalConnect 36812)]], general
+* [[[unitsml-36813,nofetch(CalConnect 36813)]], numeric
+* [[[unitsml-36814,nofetch(CalConnect 36814)]], unitsdb
 * [[[jcgm200,JCGM 200:2012]]] (VIM), entries 1.1–1.5, 2.30–2.38
 * [[[iso80000-1,ISO 80000-1]]] (quantities and units; scales)
 * [[[pendrill2024,nofetch(Pendrill 2024)]]] (L0–L3 concept levels; isq-smart concept system)
diff --git a/sources/unitsml-36816-conversions/sections/02-normrefs.adoc b/sources/unitsml-36816-conversions/sections/02-normrefs.adoc
index a597812..baeecd8 100644
--- a/sources/unitsml-36816-conversions/sections/02-normrefs.adoc
+++ b/sources/unitsml-36816-conversions/sections/02-normrefs.adoc
@@ -1,9 +1,9 @@
 [bibliography]
 == Normative references
 
-* [[[unitsml-36812,nofetch(CalConnect 36812)]]]
-* [[[unitsml-36813,nofetch(CalConnect 36813)]]]
-* [[[unitsml-36814,nofetch(CalConnect 36814)]]]
-* [[[unitsml-36815,nofetch(CalConnect 36815)]]]
+* [[[unitsml-36812,nofetch(CalConnect 36812)]], general
+* [[[unitsml-36813,nofetch(CalConnect 36813)]], numeric
+* [[[unitsml-36814,nofetch(CalConnect 36814)]], unitsdb
+* [[[unitsml-36815,nofetch(CalConnect 36815)]], units model
 * [[[xsd-float64,nofetch(UnitsML 1.0 XSD Float64ConversionFromType)]]] (the data syntax)
 * [[[jcgm100,JCGM 100:2008]]] (exactness discipline analogy)
diff --git a/sources/unitsml-36817-asciiunits/sections/02-normrefs.adoc b/sources/unitsml-36817-asciiunits/sections/02-normrefs.adoc
index 946792d..e8b3ec8 100644
--- a/sources/unitsml-36817-asciiunits/sections/02-normrefs.adoc
+++ b/sources/unitsml-36817-asciiunits/sections/02-normrefs.adoc
@@ -1,7 +1,7 @@
 [bibliography]
 == Normative references
 
-* [[[unitsml-36812,nofetch(CalConnect 36812)]]]
-* [[[unitsml-36814,nofetch(CalConnect 36814)]]]
+* [[[unitsml-36812,nofetch(CalConnect 36812)]], general
+* [[[unitsml-36814,nofetch(CalConnect 36814)]], unitsdb
 * [[[parg,nofetch(PARG grammar language and artifact format)]]] (parsanol/docs)
 * [[[cc36810,nofetch(CalConnect 36810)]]], _AsciiUnits syntax specification_ (v1 base standard, frozen 2025-03; historical)
diff --git a/sources/unitsml-36818-xml-usage/sections/02-normrefs.adoc b/sources/unitsml-36818-xml-usage/sections/02-normrefs.adoc
index 745a80f..4047d97 100644
--- a/sources/unitsml-36818-xml-usage/sections/02-normrefs.adoc
+++ b/sources/unitsml-36818-xml-usage/sections/02-normrefs.adoc
@@ -1,9 +1,9 @@
 [bibliography]
 == Normative references
 
-* [[[unitsml-36812,nofetch(CalConnect 36812)]]]
-* [[[unitsml-36814,nofetch(CalConnect 36814)]]]
-* [[[unitsml-36815,nofetch(CalConnect 36815)]]]
-* [[[unitsml-36816,nofetch(CalConnect 36816)]]]
+* [[[unitsml-36812,nofetch(CalConnect 36812)]], general
+* [[[unitsml-36814,nofetch(CalConnect 36814)]], unitsdb
+* [[[unitsml-36815,nofetch(CalConnect 36815)]], units model
+* [[[unitsml-36816,nofetch(CalConnect 36816)]], conversions
 * [[[xsd-spec,nofetch(generated XSD specification)]]] (base document)
 * [[[unitsml-xsd,nofetch(UnitsML 1.0 XSD)]]] (unitsml-v1.0.xsd)
diff --git a/sources/unitsml-36819-conformance/sections/02-normrefs.adoc b/sources/unitsml-36819-conformance/sections/02-normrefs.adoc
index ff4556d..e8209e1 100644
--- a/sources/unitsml-36819-conformance/sections/02-normrefs.adoc
+++ b/sources/unitsml-36819-conformance/sections/02-normrefs.adoc
@@ -1,8 +1,8 @@
 [bibliography]
 == Normative references
 
-* [[[unitsml-36812,nofetch(CalConnect 36812)]]]
-* [[[unitsml-36813,nofetch(CalConnect 36813)]]]
+* [[[unitsml-36812,nofetch(CalConnect 36812)]], general
+* [[[unitsml-36813,nofetch(CalConnect 36813)]], numeric
 * [[[tested-parts,nofetch(tested parts)]]] — CalConnect 36814–7 and the Plurimath series parts under test
 * [[[jcgm101,JCGM 101:2008]]], Clause 7.9 (adaptive procedure)
 * [[[jcgm106,JCGM 106:2012]]] (decision vectors)