T. Zhang, Y. Z. Fang, M. Dressel, X. P. Wang, and Q. F. Fang. Nanometer size effect on the structure and magnetic properites of hige oxygen content ferromagnetic PrMnO3+δ nanoparticles. Journal of Applied Physics, (108)11:113901, December 2010. [PUMA: effect ferromagnetic nanometer nanoparticles size]