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We analyze the mixing of the scalar glueball with the scalar-isoscalarquarkonia states above 1 GeV in a non-local covariant constituent approach.Similarities and differences to the point-particle Klein-Gordon limit and tothe quantum mechanical case are elaborated. Model predictions for thetwo-photon decay rates in the covariant mixing scheme are indicated.Comment: 28 pages, 6 figure

Covariant constituent quark-gluon model for the glueball-quarkonia content of scalar-isoscalar mesons