DavidEmin [Phys.Rev. Lett.28, 604 (1972)].Equation (4) should read (E~/6J)(a/R~)2 &K, and the first complete sentence below Eq. ( 4) should be replaced by the following: "Condition (4) insures that the weak-coupling solution is energeti- cally stable with respect to a reduction of the po- laron radius." While Fig. 1 remains illustrative
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Lovesey et al. (1972) studied this question.