Theoretical study of the structures, stabilities, and electronic properties of neutral and anionic Ca2Siλn (n = 1-8, λ = 0, +1) clustersShuai Zhang, Chao Zheng He, Pan Pan Zhou, Cheng Lu and Gen Quan LiEur. Phys. J. D, 68 4 (2014) 105DOI: https://doi.org/10.1140/epjd/e2014-40814-3