+ if(isset($is_reference)){
+ $WHERE .= ($WHERE ? " AND " : " WHERE ");
+ if($is_reference){
+ $WHERE .=
+ " #--sml_sources.reference IS NOT NULL"
+ ." AND LENGTH(#--sml_sources.reference) > 0";
+ }
+ else{
+ $WHERE .=
+ " (#--sml_sources.reference IS NULL"
+ ." OR (LENGTH(#--sml_sources.reference) = 0))";
+ }
+ }