Quasi Sturmian basis for the two-electon continuum A. S. Zaytsev, L. U. Ancarani and S. A. Zaytsev Eur. Phys. J. Plus, 131 2 (2016) 48 Published online: 25 February 2016 DOI: 10.1140/epjp/i2016-16048-0