doc: Add links to olsen93 and ong90 in bibliography

The bibliography entries for olsen93 and ong90 lacked links to
online copies.  While ong90 is available in digital form, the
olsen93 thesis is only available as a physical copy in the UCB
library.  To save people from searching for it, we still link
to it via the UCB library page.

Reported-by: jian he 
Discussion: https://postgr.es/m/CACJufxFcJYdRvzgt59N26XjFp2tFFUXu+VN+x8Uo0NbDUCMCbw@mail.gmail.com

diff --git a/doc/src/sgml/biblio.sgml b/doc/src/sgml/biblio.sgml
index aea0544bbcac2882459f58c1910f8321b774765d..cfcadabe08c1c4ed5bea4c3c3bb8ca09bd82f5a9 100644 (file)
--- a/doc/src/sgml/biblio.sgml
+++ b/doc/src/sgml/biblio.sgml
@@ -286,7 +286,7 @@ [email protected]
    
 
    
-    <span class="marked">Partial indexing in POSTGRES: research project</span>
+    <span class="marked"><ulink url="https://search.library.berkeley.edu/permalink/01UCS_BER/iqob43/alma991082339239706532">Partial indexing in POSTGRES: research project</ulink></span>
     
      
       Nels
@@ -303,7 +303,7 @@ [email protected]
 
    
    
-    <span class="marked">A Unified Framework for Version Modeling Using Production Rules in a Database System</span>
+    <span class="marked"><ulink url="https://www2.eecs.berkeley.edu/Pubs/TechRpts/1990/1466.html">A Unified Framework for Version Modeling Using Production Rules in a Database System</ulink></span>
     
      
       L.