Transition-metal redistribution in GdBa2Cu3−xMxO7−δ and YBa2Cu3−xMxO7−δ (M=Fe, Co, and Ni): Evidence for Gd-Fe(2) magnetic interactionsRemoveT. R. S. Prasanna, R. Chatterjee, R. C. O’Handley, and G. KalonjiPhys. Rev. B 46, 448 (1992)
Collective effects in vortex movements in type-II superconductors observed by a method for the registration of individual vorticesRemoveA. K. Geim, I. V. Grigorieva, and S. V. DubonosPhys. Rev. B 46, 324 (1992)
