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diff --git a/docs/ref/contrib/gis/db-api.txt b/docs/ref/contrib/gis/db-api.txt
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@@ -409,7 +409,7 @@ Aggregate PostGIS Oracle SpatiaLite
======================= ======= ====== ==========
.. rubric:: Footnotes
-.. [#fnwkt] *See* Open Geospatial Consortium, Inc., `OpenGIS Simple Feature Specification For SQL <http://www.opengis.org/docs/99-049.pdf>`_, Document 99-049 (May 5, 1999), at Ch. 3.2.5, p. 3-11 (SQL Textual Representation of Geometry).
+.. [#fnwkt] *See* Open Geospatial Consortium, Inc., `OpenGIS Simple Feature Specification For SQL <https://portal.ogc.org/files/?artifact_id=829>`_, Document 99-049 (May 5, 1999), at Ch. 3.2.5, p. 3-11 (SQL Textual Representation of Geometry).
.. [#fnewkb] *See* `PostGIS EWKB, EWKT and Canonical Forms <https://postgis.net/docs/using_postgis_dbmanagement.html#EWKB_EWKT>`_, PostGIS documentation at Ch. 4.1.2.
.. [#fndistsphere15] *See* `PostGIS documentation <https://postgis.net/docs/ST_DistanceSphere.html>`_ on ``ST_DistanceSphere``.
.. [#fnmysqlidx] *See* `Creating Spatial Indexes <https://dev.mysql.com/doc/refman/en/creating-spatial-indexes.html>`_