-card="$_GET[\"card\"]"
-filter="&filter=$_REF[\"filter\"]"
-filtertype="&filtertype=$_REF[\"filtertype\"]"
-order="&order=$_REF[\"order\"]"
+card="${_GET[card]}"
+filter="&filter=${_REF[filter]}"
+filtertype="&filtertype=${_REF[filtertype]}"
+order="&order=${_REF[order]}"