Fix bug in markdown generation

docs/publist.html

@@ -294,7 +294,8 @@
       <em>Intelligent Computer Mathematics - International Conference, CICM 2014, Coimbra, Portugal, July 7-11, 2014. Proceedings</em>
       <br/>
       <a href="http://dx.doi.org/10.1007/978-3-319-08434-3_17" class="external">DOI: 10.1007/978-3-319-08434-3_17</a> 
-      <a href="https://arxiv.org/pdf/1404.6179.pdf">Preprint</a>
+      <a href="https://arxiv.org/pdf/1404.6179.pdf">Preprint</a> 
+      <a href="https://dblp.uni-trier.de/rec/bibtex/conf/mkm/SchubotzW14">Bibtex</a>
    </li>
    <li>
       <strong>Evaluation of Similarity-Measure Factors for Formulae Based on the NTCIR-11 Math Task</strong>

gipp.bib

@@ -790,6 +790,7 @@
   editor    = {Watt, Stephen M. and Davenport, James H. and Sexton, Alan P. and Sojka, Petr and Urban, Josef},
   publisher = {Springer},
   url       = {https://doi.org/10.1007/978-3-319-08434-3_17},
+  biburl    = {https://dblp.uni-trier.de/rec/bibtex/conf/mkm/SchubotzW14},
   booktitle = {Intelligent Computer Mathematics - International Conference, {CICM} 2014, Coimbra, Portugal, July 7-11, 2014. Proceedings},
   date      = {2014},
   doi       = {10.1007/978-3-319-08434-3_17},

src/xsl/transform_md.xsl

@@ -55,7 +55,7 @@
         <xsl:if test="./bltx:userb">
           <xsl:text> </xsl:text>
           <xsl:text>[Bibtex](</xsl:text>
-          <xsl:value-of select="./bltx:usera/text()"/>
+          <xsl:value-of select="./bltx:userb/text()"/>
           <xsl:text>)</xsl:text>
         </xsl:if>
         <xsl:text>&#xa;</xsl:text>