diff --git a/fix_tei.py b/fix_tei.py
index 1797f93..f537f37 100644
--- a/fix_tei.py
+++ b/fix_tei.py
@@ -361,7 +361,7 @@ def cleanup_xml(xml_tree):
     for attribute in xml_preserve:
         attribute.attrib.pop("{http://www.w3.org/XML/1998/namespace}space")
 
-    formulae = xmltree.xpath("//t:formula", namespaces=NS_MAP)
+    formulae = xml_tree.xpath("//t:formula", namespaces=NS_MAP)
     logging.info(f"Found {len(formulae)} formulae.")
 
     for formula in formulae:
diff --git a/libeoaconvert.py b/libeoaconvert.py
index 3a39437..6290594 100644
--- a/libeoaconvert.py
+++ b/libeoaconvert.py
@@ -200,6 +200,16 @@ def plural(num, noun, plural=None):
     return phrase
 # def plural ends here
 
+
+def format_citations_tex4ht(used_citekeys, bibdata, language, tmp_filename):
+    """Return a formatted xmlstring of the used citations"""
+
+    tmp_path_md = "tmp_files" + os.path.sep + tmp_filename + ".tex"
+    tmp_path_html = "tmp_files" + os.path.sep + tmp_filename + ".html"
+
+    return references
+# def format_citations_tex4ht ends here
+
 def format_citations(used_citekeys, bibdata, language, tmp_filename):
     """Return a formatted xmlstring of the used citations"""