Double photoionization of helium: a generalized Sturmian approachJuan M. Randazzo, Darío Mitnik, Gustavo Gasaneo, Lorenzo U. Ancarani and Flavio D. ColavecchiaEur. Phys. J. D, 69 8 (2015) 189DOI: https://doi.org/10.1140/epjd/e2015-60113-9