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Physics. APS Physics. 14: 131. doi:10.1103/Physics.14.131. Ball, Philip (eight January 2016). "Focus: New Crystal Type is All the time in Motion". Coleman, Piers (9 January 2013). "Quantum physics: Time crystals". Nature. 493 (7431): 166-167. Bibcode:2013Natur.493..166C. Here's more info on frequency of speech therapy sessions look at our site. Cowen, gariae...