diff --git a/ruhr-universitat-bochum-lehrstuhl-fur-industrial-sales-and-service-engineering.csl b/ruhr-universitat-bochum-lehrstuhl-fur-industrial-sales-and-service-engineering.csl
index f9b96382b59..86026427cd4 100644
--- a/ruhr-universitat-bochum-lehrstuhl-fur-industrial-sales-and-service-engineering.csl
+++ b/ruhr-universitat-bochum-lehrstuhl-fur-industrial-sales-and-service-engineering.csl
@@ -12,7 +12,7 @@
       <email>sebastian.knop@rub.de</email>
     </author>
     <category citation-format="author-date"/>
-    <updated>2021-01-15T15:37:00+01:00</updated>
+    <updated>2021-02-25T04:41:09+00:00</updated>
     <rights license="http://creativecommons.org/licenses/by-sa/3.0/">This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 License</rights>
   </info>
   <locale xml:lang="de">
@@ -159,7 +159,7 @@
         <text variable="publisher" prefix="Dissertation, "/>
         <text variable="publisher-place" prefix=" "/>
       </else-if>
-      <else>
+      <else-if type="article-journal paper-conference" match="none">
         <choose>
           <if variable="event" match="none">
             <text variable="genre" suffix=", "/>
@@ -169,7 +169,7 @@
           <text variable="publisher-place"/>
           <text variable="publisher"/>
         </group>
-      </else>
+      </else-if>
     </choose>
   </macro>
   <macro name="event">
@@ -244,10 +244,10 @@
                 <number variable="number-of-volumes" form="numeric" prefix="/" suffix=")"/>
               </group>
             </if>
-            <else>
+            <else-if variable="volume" match="any">
               <text term="volume" form="short" text-case="capitalize-first" prefix="(" suffix=""/>
               <number variable="volume" form="numeric" suffix=")"/>
-            </else>
+            </else-if>
           </choose>
         </group>
       </else-if>
@@ -273,6 +273,9 @@
             </else>
           </choose>
         </if>
+        <else-if type="chapter">
+          <text term="in" suffix=" "/>
+        </else-if>
       </choose>
       <text variable="container-title" font-style="italic"/>
     </group>