@article{escidoc:0126, title = {{Grain boundaries as a source of ferromagnetism and increased solubility of Ni in nanograined ZnO}}, author = {Straumal, B. B. and Mazilkin, A. A. and Protasova, S. G. and Stakhanova, S. V. and Straumal, P. B. and Bulatov, M. F. and Sch\"utz, G. and Tietze, T. and Goering, E. and Baretzky, B.}, journal = {{Reviews on Advanced Materials Science}}, volume = {41}, pages = {61--71}, year = {2015}, doi = {} }