1. Multi-Scale Robotics
Lab, Institute of Robotics and Intelligent Systems, ETH Zurich, Zurich, CH-8092, Switzerland
2. Departament
de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain
3. Particle
Technology Laboratory, Institute of Process Engineering, Department
of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse
3, CH-8092 Zürich, Switzerland
4. Institució Catalana de Recerca i Estudis Avançats (ICREA), Pg. Lluís Companys 23, E-08010 Barcelona, Spain