Structural and magnetic properties of Nin (n = 2–21) clusters Q. L. Lu, Q. Q. Luo, L. L. Chen and J. G. Wan Eur. Phys. J. D, 61 2 (2011) 389-396 Published online: 03 December 2010 DOI: 10.1140/epjd/e2010-10129-8