Geometries and electronic properties of NbnV(0, ±1) (n = 1−6) clusters studied by density-functional theoryX.X. Jin, J.G. Du, G. Jiang, X. Luo and X.W. WangEur. Phys. J. D, 64 2-3 (2011) 323-329DOI: https://doi.org/10.1140/epjd/e2011-20018-3