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Communicated by Mark Kac
This research was partially supported under National Scince Foundation grant GP 32116.
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Saari, D.G. Singularities and collisions of Newtonian gravitational systems. Arch. Rational Mech. Anal. 49, 311–320 (1973). https://doi.org/10.1007/BF00250511
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DOI: https://doi.org/10.1007/BF00250511