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In 1961, Møller ^{[1] [2]} showed that a tetrad description of gravitational fields allows a more rational treatment of the energy-momentum complex than in a theory based on the metric tensor alone. The advantage of using tetrads as gravitational variables was connected with the fact that this allowed to construct expressions for the energy-momentum complex which had more satisfactory transformation properties than in a purely metric formulation.

In ^[3], it seems that in 1953 he was already director of the CERN theory study group. -- SimoneD89 ( talk) 12:06, 19 January 2021 (UTC) reply

Problem solved. I found the following reference ^[4]. Niels Bohr led the group until September 1954. Afterward, it was handed over to Christian Møller. -- SimoneD89 ( talk) 12:24, 19 January 2021 (UTC) reply

Notes