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Published online by Cambridge University Press: 14 August 2015
…“there exist many galaxies where most of the light originates in an apparently flat rotating disk, and where the random stellar motions appear to be small compared to the systematic circular motion i.e. they are apparently “cold.” Our own Galaxy is such a system, and it does not seem to suffer any large scale, large amplitude, short-time-scale instability”… Ostriker and Peebles, Ap. J. 186, 467, 1973.