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Banney, David; Young, Roger; Paul, Jonathan; Imtiaz, Mohammad; Smith, Roger . (2015). A Hypothesis for Self-Organization and Symmetry Reduction in the Synchronization of Organ-Level Contractions in the Human Uterus during Labor. Symmetry, 7(4), 1981–1988. doi:10.3390/sym7041981 
10.3390/sym7041981