code: private List<Reference> getAllOneReferences(DomainObject domainObject) {
  		List<Reference> allReferences = domainObject.getReferences();
  		List<Reference> allOneReferences = new ArrayList<Reference>();
  		for (Reference ref : allReferences) {
  			if (!ref.isMany()) {
  				allOneReferences.add(ref);
  			}
  		}
  		return allOneReferences;
  	}
docs: List of references with multiplicity = 1