query: PREFIX wikibase: <http://wikiba.se/ontology#>
  PREFIX wd: <http://www.wikidata.org/entity/> 
  PREFIX wdt: <http://www.wikidata.org/prop/direct/>
  PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
  
  SELECT * WHERE {
      ?item wdt:P428 "!" .
      ?item wdt:P428 ?authorabbrv .
  }
  ORDER BY ASC(?authorabbrv)