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Torsvik et al. 1996 Torsvik, T. H.; Smethurst, M. A.; Meert, J. G.; Van der Voo, R.; McKerrow, W. S.; Brasier, M. D.; Sturt, B. A.; Walderhaug, H. J. (1996). "Continental break-up and collision in the Neoproterozoic and Palaeozoic—a tale of Baltica and Laurentia". Earth-Science Reviews. 40 (3): 229–258. Bibcode:1996ESRv...40..229T. doi:10.1016/0012-8252(96)00008-6.