Jonathan Ross Jan Langner Malte Stonis Bernd-Arno Behrens Investigation of the required clamping force at multidirectional undercut-forging. 501-515 2018 12 Prod. Eng. 3-4 https://doi.org/10.1007/s11740-018-0830-3 db/journals/peng/peng12.html#RossLSB18