The conditions for double dislocation segment detachment from a weak pinning center were analyzed for arbitrary applied stress frequencies. Those frequency bands were found within which the dislocation internal friction was independent of amplitude.

Amplitude-Independent Internal Friction of Dislocations. V.V.Lomakin: Izvestiya Ross. Akad. Nauk – Ser. Fiz., 1997, 61[5], 941-4 (Bulletin of the Russian Academy of Sciences - Physics, 1997, 61[5], 739-41)