diff --git a/bibliography.css b/bibliography.css
index 3c50ae80af543d9d6892630e1f14534de1c16bdb..b6b2022c8f7fe2118c3a493ec25e4daa55d30e46 100644
--- a/bibliography.css
+++ b/bibliography.css
@@ -220,6 +220,11 @@ linkGrp[ana="http://purl.org/dc/terms/references"]:after{
          actionID, 'links',
          showIcon, false
 )
+"   "
+oxy_button(
+         actionID, 'links4',
+         showIcon, false
+)
 "   "
  oxy_button(
           action, oxy_action(