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Majer, J. B. and Peguiron, J. and Grifoni, Milena and Tusveld, M. and Mooij, J. E. (2003) Quantum Ratchet Effect for Vortices. Phys. Rev. Lett. 90 (5; 4 S), 056802.
Grifoni, Milena and Ferreira, M. S. and Peguiron, J. and Majer, J. B. (2002) Quantum Ratchets with Few Bands below the Barrier. Phys. Rev. Lett. 89 (14; 4 ), p. 146801.