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The isotropic-cholesteric and cholesteric-smectic-A phase transitions in cholesteryl oleyl carbonate have been studied for pressures up to 7 kbar. The latter transition possesses a tricritical point at 2.66 kbar and 60.3^∘{}C, where the behavior changes from first to second order.
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Keyes et al. (1973) studied this question.
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