Relation between (e, e′) sum rules in 6, 7Li and 4He nuclei: Experiment and cluster modelV. D. Efros, I. S. Timchenko and A. Yu. BukiEur. Phys. J. A, 52 9 (2016) 275DOI: https://doi.org/10.1140/epja/i2016-16275-x