From d72b63b7e746116e6ebcf38890da18b2106e64b9 Mon Sep 17 00:00:00 2001
From: Jay Paul Morgan <jaymiles17@gmail.com>
Date: Tue, 6 Jun 2023 14:11:52 +0100
Subject: [PATCH] Add missing reference

---
 README.md | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 462fa9b..6a08f5b 100644
--- a/README.md
+++ b/README.md
@@ -81,4 +81,8 @@ This method of detecting the solar limb is demonstrated in Pötzi et al. Kanzelh
 
 With the method originating in:
 
-Taubin, G. Estimation of Planar Curves, Surfaces, and Nonplanar Space Curves Defined by Implicit Equations with Applications to Edge and Range Image Segmentation. IEEE Transactions on Pattern Analysis and Machine Intelligence 13, no. 11 (November 1991): . https://doi.org/10.1109/34.103273.
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+Taubin, G. Estimation of Planar Curves, Surfaces, and Nonplanar Space Curves Defined by Implicit Equations with Applications to Edge and Range Image Segmentation. IEEE Transactions on Pattern Analysis and Machine Intelligence 13, no. 11 (November 1991): . https://doi.org/10.1109/34.103273.
+
+For the removal of the limb-darkening effect, we use the constants values presented in:
+
+Cox, Arthur N., ed. Allen's Astrophysical Quantities. New York, NY: Springer, 2002. https://doi.org/10.1007/978-1-4612-1186-0.
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-- 
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