Strong field approximation within a Faddeev-like formalism for laser-matter interactions Yuri Popov, Alexander Galstyan, Francisca Mota-Furtado, Patrick F. O’Mahony and Bernard Piraux Eur. Phys. J. D, 71 4 (2017) 93 Published online: 18 April 2017 DOI: 10.1140/epjd/e2017-70708-7