Rewrite bibtex superscripts to html

_config.yml

@@ -44,6 +44,9 @@ scholar:
 
   use_raw_bibtex_entry: true
   bibtex_skip_fields: ['month_numeric']
+  bibtex_filters:
+    - superscript
+    - latex
 
   sort_by: year
   order: descending

_plugins/scholar_superscript_filter.rb

+module Jekyll
+  class Scholar
+    class Superscript < BibTeX::Filter
+      def apply(value)
+        value.to_s.gsub(/\\textsuperscript\{([^}]+)\}/) {
+          "<sup>#{$1}</sup>"
+        }
+      end
+    end
+  end
+end