Minimal size of endohedral singly vanadium-doped aluminum cluster: a density-functional study Yawen Hua, Yiliang Liu, Gang Jiang and Jun Chen Eur. Phys. J. D, 67 12 (2013) 267 Published online: 17 December 2013 DOI: 10.1140/epjd/e2013-40306-0