private function mergeSourceObjects(\UR\DB\NewBundle\Entity\Source $dataMasterSource, \UR\DB\NewBundle\Entity\Source $toBeDeletedSource)
 {
     $dataMasterSource->setLabel($this->mergeStrings($dataMasterSource->getLabel(), $toBeDeletedSource->getLabel()));
     $dataMasterSource->setPlaceOfDiscovery($this->mergeStrings($dataMasterSource->getPlaceOfDiscovery(), $toBeDeletedSource->getPlaceOfDiscovery()));
     $dataMasterSource->setRemark($this->mergeStrings($dataMasterSource->getRemark(), $toBeDeletedSource->getRemark()));
     $dataMasterSource->setComment($this->mergeStrings($dataMasterSource->getComment(), $toBeDeletedSource->getComment()));
     return $dataMasterSource;
 }