Columbia subject headings:
Geometry, Differential.
Mathematical physics.
Penrose transform.
Representations of groups.
Twistor theory.
Harvard subject headings:
Geometry, Differential.
Mathematical physics.
Penrose transform.
Representations of groups.
Twistor theory.
Princeton subject headings:
Geometry, Differential.
Mathematical physics.
Penrose tranform.
Representations of groups.
Twister theory.