public function listLUByWordForm($wordform)
 {
     $criteria = $this->getCriteria();
     $criteria->select('lexeme.lexemeentries.lemma.lus.idLU');
     $criteria->where("upper(form) = upper('{$wordform}')");
     $lus = $criteria->asQuery()->chunkResult('idLU', 'idLU');
     if (count($lus) > 0) {
         $lu = new LU();
         $criteria = $lu->getCriteria()->select("idLU, concat(frame.entries.name,'.',name) as fullName");
         Base::relation($criteria, 'lu', 'frame', 'rel_evokes');
         Base::entryLanguage($criteria, 'frame');
         $criteria->where("idLU", "IN", $lus);
         $criteria->where("lemma.idLanguage", "=", "frame.entries.idLanguage");
         return $criteria->asQuery()->chunkResult('idLU', 'fullName');
     } else {
         return new \stdClass();
     }
 }