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@@ -157,20 +157,20 @@
 
       <!-- <li> Silberer, J., Santhanavanich, T., Müller, P., & Bäumer, T. (2020). 
           Promoting Objective and Subjective Safety for Cyclists in Metropolitan Areas. In Innovations for Metropolitan Areas (pp. 273–284). Springer
-          Berlin Heidelberg. https://doi.org/10.1007/978-3-662-60806-7_21  
+          Berlin Heidelberg. https://doi.org/10.1007/978-3-662-60806-7_21   
         </li> -->
       <!-- <h5>2020</h5>
       <li>
         Santhanavanich, T., Wuerstle, P., Silberer, J., Loidl, V., Rodrigues, P., and Coors, V.:
-        <a href="https://doi.org/10.5194/isprs-annals-VI-4-W2-2020-143-2020  ">3D SAFE ROUTING NAVIGATION APPLICATION FOR
+        <a href="https://doi.org/10.5194/isprs-annals-VI-4-W2-2020-143-2020   ">3D SAFE ROUTING NAVIGATION APPLICATION FOR
           PEDESTRIANS AND CYCLISTS BASED ON OPEN SOURCE TOOLS</a>, ISPRS Ann. Photogramm. Remote Sens. Spatial Inf.
-        Sci., VI-4/W2-2020, 143–147, https://doi.org/10.5194/isprs-annals-VI-4-W2-2020-143-2020  
+        Sci., VI-4/W2-2020, 143–147, https://doi.org/10.5194/isprs-annals-VI-4-W2-2020-143-2020   
       </li>
       <li>
         Schneider, S., Santhanavanich, T., Koukofikis, A., and Coors, V.:
-        <a href="https://doi.org/10.5194/isprs-annals-VI-4-W2-2020-157-2020  ">EXPLORING SCHEMES FOR VISUALIZING URBAN
+        <a href="https://doi.org/10.5194/isprs-annals-VI-4-W2-2020-157-2020   ">EXPLORING SCHEMES FOR VISUALIZING URBAN
           WIND FIELDS BASED ON CFD SIMULATIONS BY EMPLOYING OGC STANDARDS</a>, ISPRS Ann. Photogramm. Remote Sens.
-        Spatial Inf. Sci., VI-4/W2-2020, 157–163, https://doi.org/10.5194/isprs-annals-VI-4-W2-2020-157-2020  
+        Spatial Inf. Sci., VI-4/W2-2020, 157–163, https://doi.org/10.5194/isprs-annals-VI-4-W2-2020-157-2020   
       </li>
       <li>...</li>
       <br>
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         <button class="btn" style="background-color: lightgray;" id="filter2021" onclick="filter(2021)">2021</button>
         <button class="btn" style="background-color: lightgray;" id="filter2020" onclick="filter(2020)">2020</button>
         <button class="btn" style="background-color: lightgray;" id="filter2019" onclick="filter(2019)">2019</button>
+        <button class="btn" style="background-color: lightgray;" id="filter2018" onclick="filter(2018)">2018</button>
         <!--<button class="btn" style="background-color: lightgray;" id="filter2020" onclick="filter(2018)">2018</button>-->
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@@ -214,7 +215,7 @@
               <span class="badge bg-success">Open Geospatial Consortium</span>
               <span class="badge bg-danger">pgRouting</span>
               <p class="card-text"><small class="text-muted"> ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.,
-                  VI-4/W2-2020, 143–147, https://doi.org/10.5194/isprs-annals-VI-4-W2-2020-143-2020</small>  
+                  VI-4/W2-2020, 143–147, https://doi.org/10.5194/isprs-annals-VI-4-W2-2020-143-2020</small>   
 
               </p>
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@@ -237,7 +238,7 @@
               <span class="badge badge-pill badge-info">pgRouting</span>
               <span class="badge badge-pill badge-info">Warning</span>
               <p class="card-text"><small class="text-muted"> ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.,
-                  VI-4/W2-2020, 143–147, https://doi.org/10.5194/isprs-annals-VI-4-W2-2020-143-2020</small>  
+                  VI-4/W2-2020, 143–147, https://doi.org/10.5194/isprs-annals-VI-4-W2-2020-143-2020</small>   
 
               </p>
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