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The structure of a bound state of several Dirac particles is discussed.Relying on solid mathematical arguments of the Wigner-Racah algebra, it isproved the a non-negligible number of configurations is required for adescription of this kind of systems. At present, the main results are notwidely known and this is the underlying reason for the phenomenon called theproton spin crisis.

On the Crucial Significance of the Multi-Configuration Structure of a Bound State of Several Dirac Particles