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@@ -119,7 +119,7 @@ C code
From Gerald Evenden: a library of the converted NGS Vincenty geodesic procedure
and an application program, 'geodesic'. In the case of a spherical earth
-Snyder's preferred equations are used.
+[Snyder1987]_'s preferred equations are used.
* http://article.gmane.org/gmane.comp.gis.proj-4.devel/3588/