A theoretical study of the structures and chemical bonds of neptunium (III) molecules by a density functional methodYao-Peng Yin, Chen-Zhong Dong, Lei-Qiang Du, Fang-Xian Wu and Xiao-Bin DingEur. Phys. J. D, 68 10 (2014) 304DOI: https://doi.org/10.1140/epjd/e2014-50296-x