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diff --git a/buch/papers/nav/references.bib b/buch/papers/nav/references.bib
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--- a/buch/papers/nav/references.bib
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@@ -32,4 +32,10 @@
pages = {607--627},
url = {https://doi.org/10.1016/j.acha.2017.11.004}
}
+@online{nav:winkel,
+ editor={Unbekannt},
+ title = {Sphärische Trigonometrie},
+ year={2022},
+ url = {https://de.wikipedia.org/wiki/Sphärische_Trigonometrie}
+}