The first papers with group-theoretic diagramatic notation?

I. B. Levinson, ``Sums of Wigner coefficients and their graphical representation,'' Proceed. Physical-Technical Inst. Acad. Sci. Lithuanian SSR 2 (1956) 17-30.

(scan thanks to: Andrius Bernotas at Theory of Atom group, Institute of Theoretical Physics and Astronomy, Vilnius)

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