MathSciNet bibliographic data MR556628 46L30 (81C12 82A15) Batty, C. J. K. Perturbations of ground states of type ${\rm I}$${\rm I}$ $C\sp{\ast}$$C\sp{\ast}$-algebras. Proc. Amer. Math. Soc. 78 (1980), no. 4, 539–544. Article

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