doc/README.rst: remove the non-working superscript C^1

diff --git a/doc/README.rst b/doc/README.rst
index 70a10de2c99cb7f28afaf630040e4d7a077322c1..ac7454452bd714f871d3c9f44e8d73b0f23d01d4 100644 (file)
--- a/doc/README.rst
+++ b/doc/README.rst
@@ -2,8 +2,8 @@ Overview
 ========
 
 spline3 is a parallel implementation of the 3d interpolation scheme
-described in paper, `Local quasi-interpolation by cubic C\ :sup:`1`
-splines on type-6 tetrahedral partitions
+described in paper, `Local quasi-interpolation by cubic C^1 splines on
+type-6 tetrahedral partitions
 <https://doi.org/10.1093/imanum/drl014>`_ by Sorokina and
 Zeilfelder. It takes volumetric data as input, and allows you to CSI
 enhance it. The gaps are filled in with interpolated data.