TY - JOUR AU - O. Scherzer AU - L. Qiu AU - M. de Hoop DA - 2015/01/15/ ET - 2021/06/02/ IS - 1 JF - Numerische Mathematik PY - 2015 SE - 2014/03/15/ SP - 127-148 TI - An analysis of a multi-level projected steepest descent iteration for nonlinear inverse problems in Banach spaces subject to stability constraints VL - 129 ER -