Abstract
Dual string models with non-Abelian colour and flavour symmetries are investigated. For the exceptional case of SU(2) as a gauge colour symmetry a conventional string formulation is given and it is shown that the particles of the spectrum, which are colour singlets, are classified according to representations of a flavour group SU(2). The model turns out to contain ghosts independently of the value of the space-time dimension. This is also the case for models based on an O( N) underlying colour symmetry.
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