diff --git a/docs/requirements-rtd.txt b/docs/requirements-rtd.txt
index 15345247eb..7801c670f8 100644
--- a/docs/requirements-rtd.txt
+++ b/docs/requirements-rtd.txt
@@ -1,3 +1,4 @@
 sphinx-numfig
 jupyter
 sphinxcontrib-katex
+sphinxcontrib-svg2pdfconverter
diff --git a/docs/source/conf.py b/docs/source/conf.py
index a24f9b398a..55776b8f49 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -56,7 +56,7 @@ extensions = ['sphinx.ext.autodoc',
               'sphinx_numfig',
               'notebook_sphinxext']
 if not on_rtd:
-    extensions.append('sphinx.ext.imgconverter')
+    extensions.append('sphinxcontrib.rsvgconverter')
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
diff --git a/docs/source/methods/photon_physics.rst b/docs/source/methods/photon_physics.rst
index 4494fc6431..f9bdcfa1cc 100644
--- a/docs/source/methods/photon_physics.rst
+++ b/docs/source/methods/photon_physics.rst
@@ -579,7 +579,7 @@ sampled using the leading order term of the Sauter–Gluckstern–Hull
 distribution,
 
 .. math::
-    :label: sauter–gluckstern–hull
+    :label: sauter-gluckstern-hull
 
     p(\mu_{\pm}) = C(1 - \beta_{\pm}\mu_{\pm})^{-2},
 
@@ -588,7 +588,7 @@ ratio of the velocity of the charged particle to the speed of light given in
 :eq:`beta-2`.
 
 The inverse transform method is used to sample :math:`\mu_{-}` and
-:math:`\mu_{+}` from :eq:`sauter–gluckstern–hull`, using the sampling formula
+:math:`\mu_{+}` from :eq:`sauter-gluckstern-hull`, using the sampling formula
 
 .. math::
     :label: sample-mu
diff --git a/openmc/mgxs/mgxs.py b/openmc/mgxs/mgxs.py
index 46b0048385..e9fee5a2f1 100644
--- a/openmc/mgxs/mgxs.py
+++ b/openmc/mgxs/mgxs.py
@@ -3552,7 +3552,7 @@ class ScatterMatrixXS(MatrixMGXS):
     .. math::
 
        \begin{aligned}
-       \langle \sigma}_{s,\ell,g'\rightarrow g} \phi \rangle &= \int_{r \in V} dr
+       \langle \sigma_{s,\ell,g'\rightarrow g} \phi \rangle &= \int_{r \in V} dr
        \int_{4\pi} d\Omega' \int_{E_{g'}}^{E_{g'-1}} dE' \int_{4\pi} d\Omega
        \int_{E_g}^{E_{g-1}} dE \; P_\ell (\Omega \cdot \Omega') \sigma_s (r, E'
        \rightarrow E, \Omega' \cdot \Omega) \psi(r, E', \Omega')\\