Add CSD website and publication link to CSD-1000R dataset description

Author: AtharvaRai07

src/skmatter/datasets/descr/csd-1000r.rst

@@ -46,23 +46,27 @@ Of the 2'520 resulting features, 100 were selected via FPS using [C2]_.
 Chemical Properties
 -------------------
 
-The CSD-1000R dataset consists of 100 atomic environments selected from crystal structures in the `Cambridge Structural Database (CSD) <https://www.ccdc.cam.ac.uk/solutions/csd-system/components/csd/>. These environments represent a diverse set of chemical compositions and bonding types, including:
-
+The CSD-1000R dataset consists of 100 atomic environments selected from crystal structures in the Cambridge Structural Database (CSD) [C3]_. These environments represent a diverse set of chemical compositions and bonding types, including:
 
 - Metals, metalloids, and non-metals
 - Covalent, ionic, and metallic bonding environments
 - Various coordination numbers and geometries
 
 The dataset captures local chemical environments relevant for modeling properties such as nuclear magnetic resonance (NMR) chemical shieldings, aiding in the understanding of structure-property relationships in materials chemistry.
 
-For more detailed chemical information, users can refer to the original Cambridge Structural Database or the `publication by Ceriotti et al. (2019) <https://www.nature.com/articles/s41597-019-0224-1>`_.
+For more detailed chemical information, users can refer to the original Cambridge Structural Database [C3]_ or the publication by Ceriotti et al. (2019) [C4]_
+
 
 
 References
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 .. [C1] https://github.com/lab-cosmo/librascal commit ade202a6
 .. [C2] https://github.com/lab-cosmo/scikit-matter commit 4ed1d92
+.. [C3] https://www.ccdc.cam.ac.uk/structures/
+.. [C4] https://www.nature.com/articles/s41597-019-0224-1
+
+
 
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