Update paper.bib

paper.bib

@@ -57,6 +57,14 @@ @article{feng2019gramat
   publisher={Springer}
 }
 
+@article{flechtner2007aod1b,
+  title={AOD1B product description document for product releases 01 to 04 (Rev. 3.1, April 13, 2007)},
+  author={Flechtner, Frank},
+  journal={GRACE project document},
+  pages={327--750},
+  year={2007}
+}
+
 @article{humphrey2023using,
   title={Using Satellite-Based Terrestrial Water Storage Data: A Review},
   author={Humphrey, Vincent and Rodell, Matthew and Eicker, Annette},
@@ -74,6 +82,16 @@ @article{kaula1966theory
   year={1966}
 }
 
+@article{kusche2009decorrelated,
+  title={Decorrelated GRACE time-variable gravity solutions by GFZ, and their validation using a hydrological model},
+  author={Kusche, J{\"u}rgen and Schmidt, Roland and Petrovic, Svetozar and Rietbroek, Roelof},
+  journal={Journal of geodesy},
+  volume={83},
+  pages={903--913},
+  year={2009},
+  publisher={Springer}
+}
+
 @article{balmino2009efficient,
   title={Efficient propagation of error covariance matrices of gravitational models: application to GRACE and GOCE},
   author={Balmino, Georges},
@@ -209,3 +227,14 @@ @incollection{koch2020luh
   year={2020},
   publisher={Springer}
 }
+
+@article{yi2022novel,
+  title={A novel spatial filter to reduce north--south striping noise in GRACE spherical harmonic coefficients},
+  author={Yi, Shuang and Sneeuw, Nico},
+  journal={Journal of Geodesy},
+  volume={96},
+  number={4},
+  pages={23},
+  year={2022},
+  publisher={Springer}
+}