Abstract
Physical ideas and mathematical methods of molecular and nuclear physics are extended into the relativistic domain. The resulting models are noncanonical modifications of restricted modes of the string. They describe collective motions of relativistic extended objects in terms of variables which are derived from the symmetry group (for the center-of-mass motion) and from the spectrum generating group (for the intrinsic motion). The simplest relativistic model of this kind is used to calculate spectrum and radiative transitions of hadrons.
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