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Johan Hansson, A hierarchy of cosmic compact objects – without black holes. Acta Physica Polonica B, Vol. 38, p. 91 (2007). PDF

Johan Hansson and Fredrik Sandin, The observational legacy of preon stars – probing new physics beyond the LHC.

J. E. Horvath, Constraints on superdense preon stars and their formation scenarios. Astrophys. Space Sci. 307, 419 (2007).

Fredrik Sandin, Exotic Phases of Matter in Compact Stars (2007). PDF

Nature News article: Splitting the quark (Nov. 2007).