Berenschot, J.W. Tiggelaar, R. M. Geerlings, J. Gardeniers, J.G.E. Tas, N.R. Malankowska, M. Pina, M.P. Mallada, R. 3D-Fractal engineering based on oxide-only corner lithography Symp. Des. Test Integr. Packag. MEMS/MOEMS 10.1109/DTIP.2016.7514895 2016 2016