Doubly differential cross sections for ionization of lithium atom by protons and O8+ ions Andrey I. Bondarev, Yury S. Kozhedub, Ilya I. Tupitsyn, Vladimir M. Shabaev and Günter Plunien Eur. Phys. J. D, 73 3 (2019) 46 Published online: 07 March 2019 DOI: 10.1140/epjd/e2019-90635-9