PT Journal AU Albers, A Gladysz, B Heitger, N Wilmsen, M TI Categories of Product Innovations. A Prospective Categorization Framework for Innovation Projects in Early Development Phases Based on Empirical Data SO Procedia CIRP PY 2016 BP 135 EP 140 VL 50 DI 10.1016/j.procir.2016.04.197 LA english ER