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In order to solve the long-standing "centrifugal bounce or runaway" problem and also the problem of subsequent dynamical evolution, the collapse of rotating isothermal clouds has· been investigated by axisymmetric two-dimensional simulations and also by one-dimensional analysis as well as simulations in a thin disk approximation. For the initial condition, we have considered flattened configurations besides a uniform sphere.The results show that the collapse of the inner region follows a series of similar disk-like configurations nearly independent of initial and boundary conditions: The angular velocity and the column density of the disk are both proportional to (ac 2

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