Disambiguation evidence for Giuseppe Verdi's opera "Un ballo in maschera" via surface form

"Giuseppe Verdi's opera "Un ballo in maschera""

Triples (1)

Triples where some other subject referred to this entity as "Giuseppe Verdi's opera "Un ballo in maschera"".

Gustav III of Sweden → inspiredWork →
"Giuseppe Verdi's opera "Un ballo in maschera""
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