update SAMP, Voc, UCDlist and VOEvent spec refs

Author: molinaro-m

IVOAArchitecture.tex

@@ -396,7 +396,7 @@ \subsection{VOTable}
 \subsection{SAMP}
 
 The Simple Application Messaging Protocol (SAMP)
-\citep{2009ivoa.spec.0421B} is a messaging protocol that enables
+\citep{2009ivoa.spec.1216B} is a messaging protocol that enables
 astronomy
 software tools to interoperate and communicate. SAMP supports
 communication between
@@ -437,7 +437,7 @@ \section{Semantics Standards}
 
 \subsection{Vocabularies}
 
-Vocabularies in the VO \citep{2021ivoa.spec.0525D} describes how to
+Vocabularies in the VO \citep{2021ivoa.spec.0206D} describes how to
 build and use
 consensus vocabularies in the Virtual Observatory.  It supports both
 ``soft'' vocabularies based on the Simple Knowledge Organisation System
@@ -476,7 +476,7 @@ \subsection{UCD}
 effect a controlled vocabulary with a hierarchy implied through dots
 (e.g., \ucd{pos} denotes positions, \ucd{pos.eq} equatorial positions);
 this list is currently maintained as an Endorsed Note
-\citep{2021ivoa.spec.0616C}.
+\citep{2021ivoa.spec.0125C}.
 
 The atoms can then be combined into more complex labels containing
 qualifications.  For instance, \ucd{phot.mag;em.opt.V} denotes a
@@ -868,7 +868,7 @@ \subsection{SpectralDM}
 
 \subsection{VOEvent} 
 
-The VOEvent model \citep{2006ivoa.spec.1101S} defines the content and
+The VOEvent model \citep{2006ivoa.spec.0711S} defines the content and
 meaning of a standard information packet for
 representing, transmitting, publishing and archiving information about a
 transient celestial