From 859c11f133b5100a0f34807a576fbf7cb3c71fd4 Mon Sep 17 00:00:00 2001
From: taddyb <tkb5476@psu.edu>
Date: Sun, 12 Nov 2023 22:30:15 -0500
Subject: [PATCH] added deltaHBV.adj to the citations

---
 docs/index.md | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/docs/index.md b/docs/index.md
index 497b411..f3d93a6 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -97,5 +97,14 @@ HydroDL is a coding library designed to model hydrologic systems using neural ne
     prediction accuracy. Water Resources Research, 58(10), p.e2022WR032404.
     ``` 
 
+=== "$\delta$ HBV.adj"
+
+    ```
+    Song, Yalan, Wouter Knoben, Martyn P. Clark, Dapeng Feng, Kathryn Lawson, and Chaopeng 
+    Shen, When ancient numerical demons meet physics-informed machine learning: adjoint-based 
+    gradients for implicit differentiable modeling 
+    Preprint link: https://hess.copernicus.org/preprints/hess-2023-258/ 
+    ```
+
 </div>