docs: def get_external_references(self):
          """
          Returns the external references of the element
          @rtype: L{CexternalReference}
          @return: the external references (iterator)
          """
          node = self.node.find('externalReferences')
          if node is not None:
              ext_refs = CexternalReferences(node)
              for ext_ref in ext_refs:
                  yield ext_ref