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V. Zhukova
Dpto. Fisica de Materiales Basque Country University, UPV/EHU, San SebastianDonostia-San Sebastian, Spain
J. J. del Val
Dpto. Fisica de Materiales Basque Country University, UPV/EHU, San SebastianDonostia-San Sebastian, Spain
M. Ipatov
Dpto. Fisica de Materiales Basque Country University, UPV/EHU, San SebastianDonostia-San Sebastian, Spain
M. Ilyn
Dpto. Fisica de Materiales Basque Country University, UPV/EHU, San SebastianDonostia-San Sebastian, Spain
A. Granovsky
Moscow State University, Faculty of Physics
Russian Federation and Dpto. Fisica de Materiales, Basque Country University, UPV/EHU San Sebastian
Moscow, Russia
A. Zhukov
Dpto. Fisica de Materiales Basque Country University, UPV/EHU, and IKERBASQUE, San Sebastian and BilbaoDonostia-San Sebastian, Spain