Update the page with the paper

Signed-off-by: Bruno Khélifi <khelifi@in2p3.fr>

about.html

@@ -93,7 +93,8 @@ <h1>About</h1>
         <br>
 
         <p>
-        <a href="#project">What is Gammapy?</a> | <a href="#acknowledge">Acknowledging Gammapy</a> | <a href="#publications">Publications</a> | <a href="#awards">Awards and Prizes</a> 
+<!--         <a href="#project">What is Gammapy?</a> | <a href="#acknowledge">Acknowledging Gammapy</a> | <a href="#publications">Publications</a> | <a href="#awards">Awards and Prizes</a>-->
+        <a href="#project">What is Gammapy?</a> | <a href="#publications">Publications</a> | <a href="#awards">Awards and Prizes</a>
         </p>
 
         <br>
@@ -121,7 +122,14 @@ <h2 id="project"><a href="#gp"> What is Gammapy?</a></h2>
             populations.
         </p>
 
-        <br><br>
+        <br>
+        <p>
+            When using Gammapy for your publication, please follow the citation scheme presented in the
+            <a href="acknowledging.html">acknowledgment page</a> in order to support the
+            Gammapy team.
+        </p>
+
+<!--         <br><br>
         <h2 id="acknowledge"><a href="#acknowlegment"> Acknowledging Gammapy </a></h2>
 
         <h3>In Publications</h3>
@@ -146,15 +154,18 @@ <h3>In Presentations</h3>
         <p>If you are giving a presentation or talk featuring work/research that makes
             use of Gammapy we would like to ask you to acknowledge Gammapy by using this logo
         <p><img style="width:70%;" draggable="false" src="img/gammapy_banner.png" alt="Gammapy banner"/></p>
-        </p>
+        </p>-->
 
         <br><br>
         <h2 id="publications"><a href="#pub"> Publications </a></h2>
         <ul>
-            <li><a href="https://www.aanda.org/articles/aa/abs/2019/12/aa36452-19/aa36452-19.html" class="card-link">A&amp;A 632, A72 (2019)</a> -
+            <li><a href="https://www.aanda.org/articles/aa/abs/2023/10/aa46488-23/aa46488-23.html" class="card-link">A&A, 678, A157 (2023)</a> -
+                “Gammapy: A Python package for gamma-ray astronomy ”
+            </li>
+            <li><a href="https://www.aanda.org/articles/aa/abs/2019/12/aa36452-19/aa36452-19.html" class="card-link">A&amp;A, 632, A72 (2019)</a> -
                 “Validation of open-source science tools and background model construction in &gamma;-ray astronomy”
             </li>
-            <li><a href="https://www.aanda.org/articles/aa/full_html/2019/05/aa34938-18/aa34938-18.html" class="card-link">A&amp;A 625, A10 (2019)</a> -
+            <li><a href="https://www.aanda.org/articles/aa/full_html/2019/05/aa34938-18/aa34938-18.html" class="card-link">A&amp;A, 625, A10 (2019)</a> -
                 “Towards open and reproducible multi-instrument analysis in gamma-ray astronomy”
             </li>
             <li><a href="https://ui.adsabs.harvard.edu/abs/2017ICRC...35..766D" class="card-link">2017ICRC...35..766D</a> -