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-rw-r--r--docs/source/projections/cass.rst2
1 files changed, 1 insertions, 1 deletions
diff --git a/docs/source/projections/cass.rst b/docs/source/projections/cass.rst
index 1b81bd13..e8abfac7 100644
--- a/docs/source/projections/cass.rst
+++ b/docs/source/projections/cass.rst
@@ -44,7 +44,7 @@ Example using EPSG 3068 (Soldner Berlin)::
Mathematical definition
#######################
-The formulas describing the Cassini projection are all taken from proj4 sources.
+The formulas describing the Cassini projection are taken from Snyder's [Snyder1987]_.
:math:`\phi_0` is the latitude of origin that match the center of the map (default to 0). It can be set with ``+lat_0``.