TY - JOUR AU - Olesia Oliinyk AU - Kai Petersen AU - Manfred Schoelzke AU - Martin Becker AU - Soeren Schneickert BT - Requirements Engineering M1 - 1 PB - Springer London PY - 2017 SP - 105 EP - 135 T2 - Requirements Engineering TI - Structuring automotive product lines and feature models: an exploratory study at Opel VL - 22 ER -