Freudensprung, I., Joe, D., Nietzel, S., Vollmer, D., Klapper, M., & Müllen, K. (2016). Spherical Polyolefin Particles from Olefin Polymerization in the Confined Geometry of Porous Hollow Silica Particles. Macromolecular Rapid Communications, 37(20), 1651-1656. doi:10.1002/marc.201600295.