Add reference to gapfilling paper of Amber (#486)

metobs_toolkit/dataset_gap_handling.py

@@ -835,6 +835,11 @@ def fill_gaps_with_debiased_modeldata(
                               2022-09-01 22:00:00+00:00  18.17   debiased modeldata fill  Modelvalue: 18.78 cor...
                               2022-09-01 23:00:00+00:00  17.63   debiased modeldata fill  Modelvalue: 18.23 cor...
 
+        References
+        -----------
+        Jacobs .A, et. al. (2024) `Filling gaps in urban temperature observations by debiasing ERA5 reanalysis data <https://doi.org/10.1016/j.uclim.2024.102226>`_
+
+
         """
 
         # Check if the Model has the compatible data
@@ -1052,6 +1057,11 @@ def fill_gaps_with_diurnal_debiased_modeldata(
             <BLANKLINE>
             [51 rows x 3 columns]
 
+
+        References
+        -----------
+        Jacobs .A, et. al. (2024) `Filling gaps in urban temperature observations by debiasing ERA5 reanalysis data <https://doi.org/10.1016/j.uclim.2024.102226>`_
+
         """
 
         # Check if the Model has the compatible data
@@ -1280,6 +1290,11 @@ def fill_gaps_with_weighted_diurnal_debias_modeldata(
             <BLANKLINE>
             [51 rows x 3 columns]
 
+
+        References
+        -----------
+        Jacobs .A, et. al. (2024) `Filling gaps in urban temperature observations by debiasing ERA5 reanalysis data <https://doi.org/10.1016/j.uclim.2024.102226>`_
+
         """
 
         # Check if the Model has the compatible data