Add reference to newest technical report of WMM.

Mayitzin · Aug 22, 2023 · 44bdb63 · 44bdb63
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commit 44bdb63
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diff --git a/ahrs/utils/wmm.py b/ahrs/utils/wmm.py
@@ -200,6 +200,8 @@
     Standarization Document. 2014.
     ftp://ftp.nga.mil/pub2/gandg/website/wgs84/NGA.STND.0036_1.0.0_WGS84.pdf
 .. [WMM] The World Magnetic Model (https://www.ncei.noaa.gov/products/world-magnetic-model)
+.. [WMM-TR] Chulliat, A. et al. (2020). The US/UK World Magnetic Model for
+    2020-2025 : Technical Report. https://doi.org/10.25923/ytk1-yx35
 .. [WMM2020] WMM2020 Model values: NCEI Geomagnetic Modeling Team and British
     Geological Survey. 2019. World Magnetic Model 2020. NOAA National Centers
     for Environmental Information. doi: 10.25921/11v3-da71, 2020.