The Clebsch–Gordon expansions involving two
harmonics have been used in the text. They are fairly long and are not given here but can be found in
"Null Geodesic Congruences, Asymptotically-Flat Spacetimes and Their Physical Interpretation"
Timothy M. Adamo and Ezra T. Newman and Carlos Kozameh
Living Rev. Relativity
15, (2012), 1
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