What is {population} of {Siena} that is {determination method} is {demographic balance} ?
How was Siena's demographic balance determined?
What method was used to determine Siena's demographic balance?
SELECT ?k WHERE { resource:Siena property:population ?a . ?a property:determination_method resource:demographic_balance . ?a property:population ?k }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q2751> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1082> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P459> <http://wikidata.dbpedia.org/resource/Q15911027>
} 

SELECT ?obj WHERE { wd:Q2751 p:P1082 ?s . ?s ps:P1082 ?obj . ?s pq:P459 wd:Q15911027 }