DFT calculations of the structures, electronic and spectral properties for FenSm (2 ≤ n + m ≤ 5) clustersYuqi Chen, Hongyan Wang, Xiumei Li, Tian Zhang and Hui WangEur. Phys. J. D, 73 3 (2019) 59DOI: https://doi.org/10.1140/epjd/e2019-90640-0