Effects of hydrogen annealing and codoping (Mn, Fe, Ni, Ga, Y) of nanocrystalline Cu-doped ZnO dilute magnetic semiconductorMohamed Bououdina and Aqeel Aziz DakhelEur. Phys. J. Appl. Phys., 69 1 (2015) 10601DOI: https://doi.org/10.1051/epjap/2014140185