參考文獻:
EVONIK DEGUSSA GmbH Klasovsky, Florian Tacke, Thomas Pfeffer, Jan Christoph Haas, Thomas Beller, Matthias Martin, Andreas Deutsch, Jens Koeckritz, Angela Imm, Sebastian Haberland, Juergen Patent: US2013/331580 A1, 2013 Location in patent: Paragraph 0063