/**
  * Additional item display: display reverse references and reference maps / 2nd level reference maps
  */
 public function hookAdminItemsShow($args)
 {
     echo '<link href="' . css_src('item-references-maps') . '" rel="stylesheet">';
     if (SELF::$_enhancedGeoLog) {
         $overlays = GeolocationPlugin::GeolocationConvertOverlayJsonForUse();
     } else {
         $overlays = null;
     }
     SELF::_displaySelfReferences($args);
     $js = "";
     $js .= SELF::_displayReferenceMaps($args, $overlays);
     $js .= SELF::_displaySecondLevelReferenceMaps($args, $overlays);
     if ($js) {
         if ($overlays) {
             $js .= "var mapOverlays = " . $overlays["jsData"] . ";";
         }
         echo "<script type='text/javascript'>\n" . $js . "\n</script>";
     }
 }