Columbia subject headings:
Theater--21st century--History and criticism.
Theater--Europe, German-speaking--21st century--History and criticism.
Tragedy--21st century--History and criticism.
Tragedy--21st century--History and critisim--Europe, German-speaking.
Harvard subject headings:
Performance art--Europe, German-speaking--History--21st century--Congresses.
Sophocles. Antigone--Congresses.
Theater--Europe, German-speaking--History--21st century--Congresses.
Theater--History--21st century--Congresses.
Tragedy--History and criticism--Congresses.
Tragicomedy--History and criticism--Congresses.
Princeton subject headings:
Theater--21st century--History and criticism.
Theater--Europe, German-speaking--21st century--History and criticism.
Tragedy--21st century--History and criticism.
Tragedy--21st century--History and critisim--Europe, German-speaking.