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The properties of null geodesic congruences (NGCs) in Lorentzian manifolds are a topic of considerable importance.
Null electromagnetic fields
Robinson, I · 1961
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A theorem on Petrov types
Goldberg, J., and Sachs, R · 1962
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Some spherical gravitational waves in general relativity
Robinson, I., and Trautman, A · 1962
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Twistor algebra
Penrose, R · 1967
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Coordinate systems associated with asymptotically shear-free null congruences
Aronson, B., and Newman, E. T · 1972
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Heaven and its properties
Newman, E. T · 1976
Earlier work this paper cites.
The Kähler structure of asymptotic twistor space
Ko, M., Newman, E. T., and Penrose, R · 1977
Cited alongside, same era.
The metric and curvature properties of ℋ \mathcal{H} -space
Hansen, R., Newman, E. T., Penrose, R., and Tod, K. P · 1978
Cited alongside, same era.
The universal cut function and type II metrics
Kozameh, C., Newman, E., Santiago-Santiago, J., and Silva-Ortigoza, G · 1979
Cited alongside, same era.
An Introduction to Twistor Theory
Hugget, S. A., and Tod, K. P · 1985
Cited alongside, same era.
Spinors and Space-time
Penrose, R., and Rindler, W · 1986
Cited alongside, same era.
Green’s functions of the ð \eth operators
Ivancovich, J., Kozameh, C., and Newman, E. T · 1989
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Generic isolated horizons and their applications
Ashtekar, A., Beetle, C., Dreyer, O., Fairhurst, S., Krishnan, B., Lewandowski, J., and Wisniewski, J · 2000
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Geometry of generic isolated horizons
Ashtekar, A., Beetle, C., and Lewandowski, J · 2002
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Null geodesic congruences, asymptotically flat space-times and their physical interpretation
Adamo, T. M., Kozameh, C., and Newman, E. T · 2009
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Vacuum non-expanding horizons and shear-free null geodesic congruences
Adamo, T. M., and Newman, E. T · 2009
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