A. R. Edmonds, Angular Momentum in Quantum Mechanics, Princeton University Press 1974.
 E. Condon, and G. Shortley, The Theory of Atomic Spectra, Cambridge, 1935.
C JMj1 m1, j2 m2often also denoted as
<j1 m1, j2 m2|j1 j2 J M> and referred to as vector-coupling or Wigner
coefficient. The calculation uses the phase convention [1,2], where <j1 j1, j2
m2|j1 j2 J J> is positive for all allowed J (m2=J-j1)
The Wigner 3-j symbol is a more symmetric expression of the vector coupling,
directly related to the Clebsch-Gordan coefficient. For symmetry property and
other relations see .
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