What is {twinned administrative body} of {Dortmund} that is {start time} is {1981-0-0} ?
Which is {twinned regulatory body} of {Dortmund} where {begin time} is {1981-0-0} ?
Which is {twinned administrative body} of {Dortmund} where {start time} is {1981-0-0} ?
SELECT ?h WHERE { ?l property:twinned_administrative_body ?h . ?l property:start_time ?k . resource:Dortmund property:twinned_administrative_body ?l . FILTER ( CONTAINS ( YEAR ( ?k ) , '1981' ) ) }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q1295> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P190> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P580> <1981-0-0>
} 

SELECT ?obj WHERE { wd:Q1295 p:P190 ?s . ?s ps:P190 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1981')) }